Complex sentence: Many of the shows originated from U.S. Army camps around the country, where Welles entertained the troops serving during World War II. The show was sponsored by Mobil Oil, with whom Welles had an ongoing battle that shortened the life of the series.
Split into simpler sentences: Many of the shows originated from U.S. Army camps where Welles entertained the troops. December 3,1988, page 64 Welles had an ongoing battle with the program's sponsor, Mobil Oil, which shortened the life of the series.