Complex sentence: In response to the feedback, Thiesmeyer convinced Harrison to officially join the show's as its lead dance choreographer while helping him relocate to Germany once his active Military duty in Germany ended in 1983.
Split into simpler sentences: In response to the feedback, Thiesmeyer convinced Harrison to officially join the show's as its lead dance choreographer and helped Harrison relocate to Germany. Once his active Military duty in Germany ended in 1983.