I forgot to add these two long sentences. I really need to improve the punctuation.
1) A group of journalists followed the drama series but most of them were negative about it because in their opinion "Kid Nation" was too difficult for young people and it exploited them; but the contestants didn't agree with the journalists, they were positive about the experience.
2) At the end of the series there was a big prize for the winner.
1. FAR too long for one sentence. How will you divide it? I see three separate sentences there.
2. comma needed