Complex sentence: Alexander also brought several other gospel groups to the label, but devoted much of his attention to the Soul Stirrers; the Soul Stirrers, with Cooke, and the Pilgrim Travelers, with Alexander, toured extensively together in the early and mid 1950s.
Split into simpler sentences: Alexander also brought several other gospel groups to the label, but devoted much of his attention to the Soul Stirrers. The Soul Stirrers, with Cooke, and the Pilgrim Travelers, with Alexander, toured extensively together in the early and mid 1950s.