Complex sentence: Jim Catania, nicknamed "Mr. Jim", replaced Manny Martínez as the Misfits' drummer in the Fall of 1978, having previously performed in a local band called Whodat and Boojang with Misfits singer Glenn Danzig.
Split into simpler sentences: Jim Catania, nicknamed "Mr. Jim", was the Misfits' second drummer, replaced Manny Martínez in the Fall of 1978. He had previously performed in a local band called Whodat and Boojang with Misfits singer Glenn Danzig.