Complex sentence: Their adopted daughter Sandy, was somewhat shy and not too fond of show business, declined any attempt to get her on the show as a regular cast member, though she appeared in a few episodes as a classmate of Ronnie.
Split into simpler sentences: Their adopted daughter Sandy was somewhat shy and not too fond of show business. She declined efforts to get her on the show as a regular cast member, though she appeared in a few episodes as a classmate of Ronnie.