Complex sentence: At first, Burnin' Daylight was intended to be only a live band; however, the group sent a tape to Mike Curb, head of the Curb Records label, who signed the group in 1997.
Split into simpler sentences: At first, Burnin' Daylight was intended to be only a live band. They eventually sent a tape to Mike Curb, head of the Curb Records label, who signed the group in 1997.