Complex sentence: Knowing he is about to turn to a walker, Lee gives Clementine some last pieces of advice and tells her to meet Omid and Christa, and then asks her to kill him (a choice left to the player).
Split into simpler sentences: Knowing he is about to turn into a walker, Lee gives Clementine some last pieces of advice and tells her to meet Omid and Christa. He then asks her to kill him (a choice left to the player).