Complex sentence: Gilbert had fronted several bands and was one of several lead singers that passed through the ranks of Ted Nugent and The Amboy Dukes in 1971, touring with them for a year and a half before forming Shadow which led to a record deal with RSO.
Split into simpler sentences: Gilbert had fronted several bands and was one of several lead singers that passed through the ranks of Ted Nugent and The Amboy Dukes. In 1971, he toured with them for a year and a half before forming Shadow which led to a record deal with RSO.