Complex sentence: The "Dungeon Master's Design Kit" was designed by Harold Johnson and Aaron Allston, with a cover by Keith Parkinson and interior illustrations by George Barr, and was published by TSR in 1988 as three 32-page books and an outer folder.
Split into simpler sentences: The "Dungeon Master's Design Kit" was designed by Harold Johnson and Aaron Allston, with a cover by Keith Parkinson and interior illustrations by George Barr. It was published by TSR in 1988 as three 32-page books and an outer folder.