Complex sentence: Green Lantern, Green Arrow, and Ray proceed to question Prometheus, but soon learn that it's not him but Clayface impersonating him; they realize they've fallen into a trap just as a bomb goes off.
Split into simpler sentences: Green Lantern, Green Arrow, and Ray proceed to question Prometheus, but soon learn that it is Clayface impersonating him. They realize they've fallen into a trap just as a bomb goes off.