The phrase "a unit composed of" is correct and usable in written English.
It can be used when describing the components or elements that make up a particular unit or entity.
Example: "The research team is a unit composed of experts from various fields, including biology, chemistry, and physics."
Alternatives: "a group made up of" or "an entity consisting of".
He had enlisted in the 13th Tennessee Calvary Regiment, a unit composed of pro-Union Tennesseans, but contracted smallpox in Nashville and died in 1864.
He petitioned to be given command of the 20th New York, a unit composed of German immigrants that Vegesack, being fluent in German, thought he was a natural to lead.
Lamb described the morpheme as a unit composed of morphons (roughly equivalent to what other linguists have called morphophonemes) that is related to a combination of one or more compositional units of the stratum above, lexons, by means of the relationship of realization.
A site is defined as a unit composed of human resources that interact with other sites (nodes).
The ophiolite sequence is divided into a unit of cumulate layered gabbro (Ophiolite 1), and a unit composed of harzburgite with minor lherzolite and dunite (Ophiolite 2).
Each 3-D structure was designed to have a unit composed of a planar island for cell growth and surrounding grooves exhibiting cell repellency.
However, a sentence is a grammatical unit, composed of a subject and a predicate.
Like the other nitrogenous components of nucleic acids, thymine is part of thymidine, a corresponding nucleoside (a structural unit composed of a nitrogen compound and a sugar), in which it is chemically linked with the sugar deoxyribose.
Given these two assumptions, the proposed model captures the situation of a family unit composed of a worker engaged in migration (the parent migrant) and a left-behind child.
It is also part of thymidylic acid, a nucleotide (a larger structural unit composed of a nucleoside and phosphoric acid), which is a phosphate ester of thymidine.
In World War I Hitchcock was a combat aviator with the Lafayette Escadrille, a French unit composed of volunteers from the United States.
