I really need to know if the rephrasing is correct. As I'm not a native speaker, I need to consider all the possible alternatives (?).It doesn't matter if the same concept has been repeated all over again.Thank you very much for you cooperation!

1.Kurtz wanted to realize (to fulfil) his highly moral ideals but he failed. He wanted his ideals to come true but he failed because he was left alone to face the wilderness of the jungle. The jungle had gone into him and had taken hold of him.
2.Actually, he even took part in the natives’ (?) midnight dances and in their terrible ceremonies. He also decorated the wooden posts surrounding his house with human skulls.
3.The natives thought he was like a God on earth mainly because of his guns (can you say: mainly for his guns?).He became subject (a slave, a prey ?) to his own desires. His desires drove him mad.
4.He was dressed in highly (AND NOT very) coloured clothes and appeared like a harlequin (he looked like a harlequin ?). His clothes made him appear like a harlequin. The Russian was colorfully dressed. He wore an ironed and starched white shirt. (can you also say: he was dressed in…./ he had …. on ?)
5.Before dying Kurtz struggled against the darkness and the horror which his actions had caused on his soul. He struggled against the madness of his soul due to the terrible things he had experienced.
6.He eventually (?) or Eventually, he looked back at the terrible things he had committed and was horrified by the sight. Kurtz had the courage to look into the darkness of his soul.

1. delete "ideals" and insert "dreams"

2. natives' = correct

3. delete "for his guns" -- use "slave" not "subject"

4. "highly coloured" = correct; "looked like a harlequin" = correct; delete "ironed and" -- and yes, you can use any of those alternatives at the end

5. comma after "dying"; delete "on his soul"; delete "due to" and insert "because of"

6. "Eventually, he ... " is best; "things he had done" (not committed)

1. The rephrasing is correct. Another alternative could be: "Kurtz desired to fulfill his highly moral ideals but was unsuccessful. Despite his intention for his ideals to become reality, he faced isolation in the jungle, which had consumed and dominated him."

2. The rephrasing is correct. Instead of "natives'," you can say "the natives'." Another alternative could be: "He even participated in midnight dances and gruesome ceremonies of the natives. He adorned the wooden posts surrounding his house with human skulls."

3. The rephrasing is correct. Instead of "mainly because of his guns," you can say "mainly for his guns." Another alternative could be: "The natives regarded him as a deity on earth, primarily due to his possession of guns. He became captive to his own desires, which ultimately drove him insane."

4. The rephrasing is correct. Instead of "highly colored," you can say "very colored." Another alternative could be: "He was dressed in brightly colored clothes and resembled a harlequin. The Russian, on the other hand, wore a vividly adorned, ironed and starched white shirt."

5. The rephrasing is correct. Another alternative could be: "Before his death, Kurtz fought against the darkness and horror that had enveloped his soul as a result of his actions. He struggled to maintain his sanity in the face of the dreadful experiences he had encountered."

6. The rephrasing is correct. Instead of "he eventually," you can say "eventually, he." Another alternative could be: "Eventually, he reflected upon the horrendous deeds he had committed and was appalled by the sight. Kurtz bravely confronted the darkness within his soul."