Complex sentence: Jerry remembers from his time in the Boy Scouts that the horn blasts are Morse Code and translates that the trucks are demanding humans start pumping fuel, to which the trucks assure they will not attack people who refuel them.
Split into simpler sentences: Jerry remembers from his time in the Boy Scouts that the horn blasts are Morse Code, and translates that the trucks are demanding humans start pumping fuel. The trucks assure they will not attack people who refuel them.