Complex sentence: For all the musicians, this was their first attempt at a musical career, and they developed a sound inspired by The Shadows and Bill Black, both of whom they incorporated into their live repretoire.
Split into simpler sentences: For all the musicians, this was their first attempt at a musical career, and they developed a sound rooted in rock and roll and blues. Soon, the band was enamored with the music of The Shadows and Bill Black, both of whom they incorporated into their live repretoire.