Complex sentence: He also shortened the music by cutting a few numbers, and shortening single movements; for example using only the first section of a da capo aria; on van Swieten's request, he wrote a new recitative.
Split into simpler sentences: He also shortened the music by cutting a few numbers, and shortening single movements; for example using only the first section of a da capo aria. On van Swieten's request, he wrote a new recitative.