Complex sentence: Glassen's career might have faded into complete obscurity had it not been for the development of eliminative materialism by fellow University of Manitoba philosophers Paul Churchland and Patricia Churchland in the 1970s, which aroused his vehement opposition and revived his interest in writing and publishing.
Split into simpler sentences: Glassen's career might have faded into complete obscurity had it not been for the development of eliminative materialism by fellow University of Manitoba philosophers Paul Churchland and Patricia Churchland in the 1970s. This aroused his vehement opposition and revived his interest in writing and publishing.