Complex sentence: Paul Pimsleur (October 17,1927--June 22,1976) was a scholar in the field of applied linguistics, who developed the Pimsleur language learning system, which along with his many publications had a significant effect upon theories of language learning and teaching.
Split into simpler sentences: Paul Pimsleur (October 17,1927--June 22,1976) was a scholar in the field of applied linguistics. He developed the Pimsleur language learning system, which along with his many publications, had a significant effect upon theories of language learning and teaching.