Complex sentence: Sphingomyelin consists of a phosphocholine head group, a sphingosine, and a fatty acid and is one of the only membrane phospholipids not synthesized from glycerol.
Split into simpler sentences: Sphingomyelin consists of a phosphocholine head group, a sphingosine, and a fatty acid. It is one of the only membrane phospholipids not synthesized from glycerol.