Complex sentence: Despite his attitude, Aramis holds very firmly to the sacred concept of friendship: in fact, the only wrong moves Aramis ever made were done when he refused to harm a friend (or a friend's feelings).
Split into simpler sentences: Despite his attitude, Aramis holds very firmly to the sacred concept of friendship. In fact, the only wrong moves Aramis ever made were done when he refused to harm a friend (or a friend's feelings).