Complex sentence: She tells Nat that she has to go, but Nat won't let her but after a while he tells her to go on her stupid cruise and to get lost, apparently dumping her and distancing himself from her.
Split into simpler sentences: She tells Nat that she has to go, but Nat won't let her. After a while he tells her to go on her stupid cruise and to get lost, apparently dumping her and distancing himself from her.