Complex sentence: Unscrupulous fisherman John Mallick and his assistant Carlo are fishing with soda bombs in open water to harvest coral reefs when they notice a large creature thrashing in the water, Mallick shoots it and discovers that it's a merman.
Split into simpler sentences: Unscrupulous fisherman John Mallick and his assistant Carlo are using fishing bombs in open water to harvest coral reefs. When they notice a large creature thrashing in the water, Mallick shoots it, and discovers that it's a merman.