Complex sentence: Tor publishes a range of their works as e-books and, in 2012, Doherty announced that his imprints would sell only DRM-free e-books by July of that year.
Split into simpler sentences: Tor publishes a range of their works as e-books. In 2012, Tom Doherty announced that his imprints would sell only DRM-free e-books by July of that year.