Complex sentence: This was the first fatality at the airport from "riding the fence", which is when people hang on to the chain-link fence at the end of the Runway 10 as an aircraft departs, attempting to withstand jet blast.
Split into simpler sentences: This was the first fatality at the airport from "riding the fence". Riding the fence is where people hang on to a chain-link fence at the end of the runway 10 as an aircraft departs, attempting to withstand jet blast.