Complex sentence: John Redpath was also a benefactor of the first endowment fund established for McGill University and his son Peter endowed a Chair of Mathematics at the university plus he built the university's Redpath Museum and Redpath Library.
Split into simpler sentences: John Redpath was also a benefactor of the first endowment fund established for McGill University. His son Peter also endowed a Chair of Mathematics at the university as well as building the university's Redpath Museum and Redpath Library.