Complex sentence: Helloween was formed in 1984 by members of bands Iron Fist, Gentry and Powerfool with Weikath, Grosskopf, singer and guitarist Kai Hansen and drummer Ingo Schwichtenberg.
Split into simpler sentences: Helloween was formed in 1984 by members of bands Iron Fist, Gentry, and Powerfool. Its first line-up consisted of Weikath, Grosskopf, singer and guitarist Kai Hansen and drummer Ingo Schwichtenberg.