Complex sentence: Sometime around 1971 he changed his name to Mad Dog Momberg, and then in 1972 he finally hit upon the gimmick that would make him a star, the character of the'evil German', Killer Karl Krupp.
Split into simpler sentences: Sometime around 1971 he changed his name to Mad Dog Momberg. In 1972 he finally hit upon the gimmick that would make him a star, the character of the'evil German', Killer Karl Krupp.