Complex sentence: An editor suggested that Williamson combine the ideas of contraterrene matter (antimatter) and asteroid mining, which inspired the Seetee (C-T) series of short stories written as Will Stewart.
Split into simpler sentences: An editor suggested that Williamson combine the ideas of contraterrene matter (antimatter) and asteroid mining. This brought about the Seetee (C-T) series of short stories written as by Will Stewart.