Complex sentence: Leon had various incarnations of the Invasion and played with various LA acts after his exciting early days, including a brief stint with Greenworld Records' midwestern act Vyper, while at the same time gathering a name for himself as a guitar amp modifying specialist.
Split into simpler sentences: Leon had various incarnations of the Invasion and played with various LA acts after his exciting early days. Leon also had a brief stint with Greenworld Records' midwestern act Vyper, while at the same time gathering a name for himself as a guitar amp modifying specialist.