Complex sentence: The company is named after the Moon's Hadley Rille feature which reveals that the publisher's roots are in science fiction, but today they publish a number of speculative fiction genres such as fantasy and steampunk.
Split into simpler sentences: The company is named after the Moon's Hadley Rille feature as a nod to the publisher's roots in science fiction. They now also publish a number of speculative fiction genres, such as fantasy and steampunk.