Complex sentence: In the early 1980s, he was a key part of Capital Comics' staff, acting as Editor-In-Chief and Art Director over such publications as Nexus, The Badger and Whisper until they ceased operation in 1984.
Split into simpler sentences: In the early 1980s, he was one of the principals of Capital Comics, acting as Editor-In-Chief and Art Director. The company's publications included Nexus, The Badger and Whisper until they ceased operation in 1984.