Complex sentence: Joan, however, elopes with her fiancé Tommy (Topher Grace), is very happy and decides that what she wants most is to be a wife and mother after graduation and asks Katherine to respect her choice.
Split into simpler sentences: Joan, however, elopes with her fiancé Tommy (Topher Grace), and is very happy. She decides that what she wants most is to be a wife and mother after graduation and asks Katherine to respect her choice.