Complex sentence: Brain was shown singing the all-gremlin version of "New York, New York" at the end of the movie, then was blasted with water and killed by getting electrocuted with the rest of the gremlins.
Split into simpler sentences: Brain was shown singing the all-gremlin version of "New York, New York". At the end of the movie, he was blasted with water and killed by getting electrocuted with the rest of the gremlins.