Complex sentence: An automatic water supply provides water under pressure to the system piping.Until All of the piping is filled with water.Then sufficient heat is applied, causing one or more sprinklers to fuse (open), the automatic sprinklers prevent the water from being discharged.
Split into simpler sentences: An automatic water supply provides water under pressure to the system piping. Until sufficient heat is applied, causing one or more sprinklers to fuse (open), the automatic sprinklers prevent the water from being discharged.