The phrase "consists partly of" is grammatically correct and can be used in written English.
It is typically used to describe something that is made up of multiple components, but not entirely. Here is an example: "The success of the project consists partly of our team's hard work and partly of luck."
Donald Trump knows that his base consists partly of conservative American Jews and evangelical voters.
(The aforementioned swing state of Pocono consists partly of upstate New York under Mr. Freeman's map, for example).
This consists partly of confession, but mostly of the monotonous constancy (the first constancy he has ever known) of housework and baby care.
The private sector of the economy consists partly of a multitude of small enterprises and partly of enterprises belonging to large French or international companies.
It consists partly of Chinese networks operating under the cover of NGOs, language institutes and small businesses.China does not always get what it wants in Nepal, however.
The book makes the point that being a host is a much more complicated business than, say, Julia Child or Martha Stewart ever let on, and that it consists partly of passive (or not so passive) aggression.
The outgoing ships bore manufactured articles; returning, their cargoes consisted partly of gold and silver bars.
G.M.'s contribution will consist partly of loans to its subsidiary, the company said in a statement.
Geologically, they consist partly of sedimentary rocks, and their structures are similar to those of the coastal mountain ranges of the adjacent continent.
The test of Brochet's that caught my eye consisted partly of asking wine drinkers to describe what appeared to be a white wine and a red wine.
Azerbaijan formed a national military in 1991, including an army (consisting partly of personnel and matériel from the Soviet 4th Army, navyy, and air force.
