Complex sentence: While at the Capitol, he pioneered orchestral radio broadcasts over station WEAF as part of the "Roxy's Gang" programs; he also engaged Eugene Ormandy as the Capitol's concertmaster and assistant conductor.
Split into simpler sentences: While at the Capitol, he pioneered orchestral radio broadcasts over station WEAF as part of the "Roxy's Gang" programs. He also engaged Eugene Ormandy as the Capitol's concertmaster and assistant conductor.