Complex sentence: During the mission, King Shark is killed by the bomb that Waller put on his neck when Riddler was trying to disable the bombs of the Suicide Squad, with Riddler attributing King Shark's tough skin as to why he wasn't able to stop it.
Split into simpler sentences: During the mission, King Shark is killed by the bomb that Waller put on his neck when Riddler was trying to disable the bombs of the Suicide Squad. Riddler attributed to King Shark's tough skin as to why he wasn't able to stop it.