Complex sentence: Johnny succeeds in breaking Doom's control over the Surfer's board, and Ben Grimm (Michael Chiklis) uses a nearby crane to knock Doom into the harbor, however, Galactus has already arrived, and Sue dies in Reed's arms.
Split into simpler sentences: Johnny succeeds in breaking Doom's control over the Surfer's board, and Ben Grimm uses a nearby crane to knock Doom into the harbor. However, Galactus has arrived, and Sue dies in Reed's arms.