The part of the sentence "composed of a group" is correct and usable in written English.
You can use it whenever you want to express that something is made of or is formed from multiple elements. For example, "The orchestra is composed of a group of talented musicians."
In urban areas such as Lomé, the traditional housing unit is a big walled compound composed of a group of isolated rooms, each opening onto a courtyard.
King Ranch, largest ranch in the United States, composed of a group of four tracts of land in southeastern Texas, totaling approximately 825,000 acres (333,800 hectares).
Jordan Reed comes off of a huge week (134 yards, 1 TD) and climbs all the way up to Tier 2. Tier 3 is composed of a group that is more touchdown-reliant for points,.
Headers are composed of a group of tubes, all of common length, connected on one end to each cylinder exhaust-valve location and on the other end to a common exit throat.
Mr. Furlong's network, composed of a group of small companies that used agents deep inside Afghanistan and Pakistan to collect intelligence on militant groups, operated under a $22 million contract run by Lockheed Martin.
The IR is composed of a group of volunteers headed by a president.
A surfactant is composed of a hydrophilic group and a hydrophobic group, and it acts as an accelerant for lignocelluloses hydrolysis in a solid-liquid phase system [ 35].
Like most juries, this one was composed of a diverse group.
Checketts considers the Rangers to be a team composed of a caretaker group of veterans overseeing a growing youth movement.
In general, phospholipids are composed of a phosphate group, two alcohols, and one or two fatty acids.
Sulfated hyaluronan (SHya), which is composed of a sulfated group and hyaluronan (Hya), has high activity on and biocompatibility with cells.
