So many so-called writers use the pretentiousism of “is comprised of” that I mention correct usages every chance I get. Here’s our current correct construction, from Jonathan Amos, of the BBC, no less:
The Annie Maunder Astrographic Telescope (AMAT) is actually a four-in-one instrument. It comprises three smaller refractors around a top-end, 14-inch (35.5cm) aperture Schmidt-Cassegrain telescope.
Remember, “comprise” goes from the single, multi-part thing to a list of its parts.