Complex sentence: After his previous band Lock Up disbanded, Morello met Zack de la Rocha, and the two founded Rage Against the Machine together, going on to become one of the most popular and influential rock acts of the 1990s.
Split into simpler sentences: After his previous band Lock Up disbanded, Morello met Zack de la Rocha, and the two founded Rage Against the Machine together. The group went on to become one of the most popular and influential rock acts of the 1990s.