Simplify the following text for a Grade 7 native English-speaking person.
Original: During this period , they performed as the opening act for Santana , The Doobie Brothers , Rush and .38 Special .
Simplified: During this period , they performed as the opening act for The Who , Carlos Santana , Pink Floyd the Doobie Brothers , Rush and .38 Special and played together with a lot of other famous musicians .