Hello. I will be very grateful for your help.

Please check the sentences:
1) "He was a great man whom I cannot remember without grief nor write about without tears."
2) "Even the animal world demonstrates more understanding than does human society."
Thank you very much for your attention.

Both are excellent.

Because 'He' refers to the subject of the sentence and shares the verb "remember" you can say 'who' "He was a great man who I cannot remember without grief nor write about without tears. Use 'whom' when it is the object of the sentence.

Second example is fine

Hello! I’d be happy to help you with your sentences.

1) "He was a great man whom I cannot remember without grief nor write about without tears."

This sentence is grammatically correct. It uses parallel construction to emphasize the emotional impact of remembering and writing about the person being referred to. The conjunction "nor" is used to indicate that both remembering and writing about the person evoke similar emotions: grief and tears.

To clarify the meaning of the sentence, it seems that the person being mentioned is greatly missed and remembering or writing about them brings sadness and tears to the speaker.

2) "Even the animal world demonstrates more understanding than does human society."

This sentence is also grammatically correct. It compares the level of understanding shown by the animal world with that of human society. The word "even" is used to suggest that the speaker finds it surprising or noteworthy that animals display more understanding than humans.

To understand the sentence further, it implies that the speaker believes that animals exhibit a greater capacity for empathy, compassion, or comprehension of their surroundings than humans do.

If you have any more questions or need further clarification, feel free to ask!