Complex sentence: Tokayer and Swartz claim that the plan, which was viewed by its proponents as risky but potentially rewarding for Japan, was named after the Japanese word for puffer-fish, a delicacy which can be fatally poisonous if incorrectly prepared.
Split into simpler sentences: Tokayer and Swartz claim that the plan, which was viewed by its proponents as risky but potentially rewarding for Japan, was named after the Japanese "fugu". A Japanese delicacy consisting of puffer-fish, which can be fatally poisonous if incorrectly prepared.