Complex sentence: Every other month "Q" and its sister magazine "Mojo" (also owned by Bauer), have a special edition magazine--these magazines have been about musical times, genres, or very important musicians.
Split into simpler sentences: Every other month "Q"-and its sister magazine, "Mojo" (also owned by Bauer)-have a special edition magazine. These magazines have been about musical times, genres, or very important musicians.