Complex sentence: The band, which was formerly known as "Droppin Trou", toured extensively as a four piece until the early 2000s in which they added Lynny Bradshaw to replicate the sound they got out of a demo that landed them a contract with Universal Records.
Split into simpler sentences: The band, which was formerly known as "Droppin Trou", toured extensively as a four piece through the early 2000s. After recording their debut, they added Lynny Bradshaw to help replicate the sounds of the record that landed them a contract with Universal Records.