Complex sentence: He then sets out to find out who his biological parents are, but disaster ensues when it turns out that his real mother (Kathy Bates) and father (Danny DeVito) are crude, lower class carnies.
Split into simpler sentences: He then sets out to find out who his biological parents are. It turns out that his real mother (Kathy Bates) and father (Danny DeVito) are crude, lower class carnies.