Complex sentence: Drexel merged with Burnham and Company in 1973 to form Drexel Burnham and Company, with Milken as one of the few prominent holdovers from the Drexel side of the merger.
Split into simpler sentences: Drexel merged with Burnham and Company in 1973 to form Drexel Burnham. Milken was one of the few prominent holdovers from the Drexel side of the merger.