Complex sentence: It was widely accepted that they did coin the related term, "debug" though this is unlikely, since the Oxford English Dictionary entry for "debug" contains a use of "debugging" in the context of air-plane engines in 1945.
Split into simpler sentences: It was widely accepted that they did coin the related term, "debug". Even this is unlikely, since the Oxford English Dictionary entry for "debug" contains a use of "debugging" in the context of air-plane engines in 1945.