Complex sentence: The band's first release to feature Radelet as vocalist and guitarist was the band's cult release "Night Drive" (2007), which marked a shift in their sound, incorporating elements of synth pop and post punk.
Split into simpler sentences: The band's first album to feature Radelet as vocalist and guitarist was their cult release "Night Drive" (2007). The record which marked a notable shift in their sound, incorporating elements of synth pop and post punk.