Original: They were Milt Kahl, John Lounsbery, Frank Thomas and Ollie Johnston, although Eric Larson was still working for Disney as a talent scout and trainer, and Wolfgang Reitherman was by that point directing and producing films.
Simplified: They were Milt Kahl, John Lounsbery, Frank Thomas and Ollie Johnston, although Eric Larson and Wolfgang Reitherman were both working for Disney, but not as animators.