Complex sentence: Dave Arneson would use "Chainmail" in his Blackmoor campaign, and the 1974 edition of Dungeons & Dragons would refer the reader to "Chainmail" for rules on the use of miniatures.
Split into simpler sentences: Dave Arneson would use "Chainmail" in his Blackmoor campaign. Moreover, the 1974 edition of Dungeons & Dragons would refer the reader to "Chainmail" for rules on the use of miniatures.