Complex sentence: Little of what Watkins had written for Camel was accepted for inclusion on the new album, so he left to launch his solo career and recorded his first solo album "Labyrinth" (with Coco Roussel on drums) in 1980.
Split into simpler sentences: Little of what Watkins had written for Camel was accepted for inclusion on the new album, so Watkins left the band to launch his solo career. He recorded his first solo album "Labyrinth" (with Coco Roussel on drums) in 1980.