Complex sentence: Although he is far stronger than any human and is still finding it hard to adjust to his new life, his unchallenged strength causes him to be alone, as he cannot make any human friends without harming them.
Split into simpler sentences: Although he is far stronger than any human and is still finding it hard to adjust to his new life. His unchallenged strength causes him to be alone, as he cannot make any human friends without harming them.