Complex sentence: At a higher level an EMP can induce a spark, for example when fuelling a gasoline-engined vehicle, such sparks have been known to cause fuel-air explosions and precautions must be taken to prevent them.
Split into simpler sentences: At a higher level an EMP can induce a spark, for example when fuelling a gasoline-engined vehicle. Such sparks have been known to cause fuel-air explosions and precautions must be taken to prevent them.