Complex sentence: The original members were guitarist Ricky Zehringer (later known as Rick Derringer), his brother Randy on drums and bass player Dennis Kelly, a lineup called "Rick and the Raiders", then later known as "The Rick Z Combo".
Split into simpler sentences: The original members were guitarist Ricky Zehringer (later known as Rick Derringer), his brother Randy on drums, and bass player Dennis Kelly. This first lineup was known as "Rick and the Raiders", and later known as "The Rick Z Combo".