Complex sentence: Saying this, however, causes an extremely flattered Milhouse to faint, thus falling off the edge of the cliff they are on, but, fortunately, a bald eagle catches him, which leads him to say "everything is coming up Milhouse!".
Split into simpler sentences: Saying this, however, causes an extremely flattered Milhouse to faint, and fall off the edge of the cliff they are on. Fortunately though, a bald eagle catches him, which leads him to happily exclaim "everything is coming up Milhouse!".