Complex sentence: They moved on to work with King Jammy on the 1989 album "Stormy Night" which was successful enough in the US to prompt the group to return there in 1991, where they added new member Maisha and signed to Sony's Chaos label.
Split into simpler sentences: They moved on to work with King Jammy on the 1989 album "Stormy Night" which was successful enough in the US to prompt the group to return there in 1991. After moving to the US they added new member Maisha and signed to Sony's Chaos label.