I don’t know when or how it started, but comprise and composed of have somehow become intertwined, resulting in the use of comprised of. Well, unfortunately, comprised of is a faulty construction.
Comprise means include, as in Haydn’s Piano Sonata No. 6 comprises (includes) four movements. If you say Haydn’s Piano Sonata No. 6 is comprised of four movements, then you’re saying Haydn’s Piano Sonata includes of four movements. Now, that just can’t be music to anyone’s ear!
You could also say Haydn’s Piano Sonata No. 6 is composed of four movements. That means Haydn’s Piano Sonata No. 6 is made up of four movements.
Let harmony be restored.
Sherry
Paul’s book–Literally, the Best Language Book Ever;
Everything Language and Grammar 