Complex sentence: The private aircraft he and the films writer/director Daniel Zirilli landed in the sea and Zirilli reports that though he was able to escape, Fredericks was trapped beneath his camera equipment and was unable to free himself before it submerged.
Split into simpler sentences: The private aircraft he and the film's writer/director Daniel Zirilli landed in the sea. Though Zirilli was able to escape, Fredericks was trapped beneath his equipment, and was unable to free himself before it submerged.