Complex sentence: Lee and Amy remain good friends eventually Lee admits to Amy he shouldn't be marrying Leanne because he is attracted to someone else they kiss and fall asleep next to each other which Leanne sees.
Split into simpler sentences: Lee and Amy remain good friends and eventually Lee admits to Amy he believes he should not be marrying Leanne because he is attracted to her. They kiss and fall asleep next to each other, something which Leanne sees.