Complex sentence: If published many award-winning stories over the 22 years it was in existence, including Robert Heinlein's novel "The Moon is a Harsh Mistress", and Harlan Ellison's short story "I Have No Mouth and I Must Scream".
Split into simpler sentences: If published many award-winning stories over the 22 years it was in existence. It serialized Robert Heinlein's "The Moon is a Harsh Mistress", and printed Harlan Ellison's "I Have No Mouth and I Must Scream".