Complex sentence: The acquisition included B&T's publishing operations for Silver Dolphin Books, Thunder Bay Press, Portable Press, and Canterbury Classics; those imprints, which collectively publish about 500 titles annually, will be continued by Readerlink.
Split into simpler sentences: The acquisition included B&T's publishing operations for Silver Dolphin Books, Thunder Bay Press, Portable Press, and Canterbury Classics. Those imprints, which collectively publish about 500 titles annually, will be continued by Readerlink.