The phrase 'each of which contributes' is correct and can be used in written English.
You can use it to introduce a list of items and explain how each one contributes to a particular outcome. For example, "The project requires several different skills, each of which contributes to its success."
That repetition appears to create real, interconnected strategic benefits, each of which contributes to competitive advantage.
The annual federal grant must be matched by the District, Maryland and Virginia, each of which contributes a third of the total.
It is made up of four distinct components, each of which contributes to an individual's unique way of seeking or avoiding sensations.
Of the many aspects of this challenge, we've identified six major themes, each of which contributes differently to helping reach 80% voter participation.
Mike Heap, the company's chief executive, said it had struck a balance between TV production and distribution, home entertainment and merchandising, each of which contributes about a third to overall revenues.
The pelvic girdle consists originally of three bones, which become fused in early adulthood and each of which contributes a part of the acetabulum, the deep cavity into which the head of the thighbone, or femur, is fitted.
Securities regulation may be divided into three broad categories: (i) disclosure duties; (ii) restrictions on fraud and manipulation; and (iii) restrictions on insider trading-each of which contributes to the creation of a vibrant market for information traders.
Additional money was raised from the Howard Gilman Foundation and the Arison Arts Foundation, each of which contributed $1 million.
Two companies that belong to the Partnership for New York City also contributed to the Committee to Save New York: Citigroup and JPMorganChase, each of which contributed $25,000.
Creating a Life achieved the media trifecta: Oprah, 60 Minutes and the cover of Time, each of which contributed its own lacerating judgments on the reproductive "mistakes" of "high achieving" women.
The common micro-genres were expositions (42.8 %) and personal reflections (41.1 %) each of which contributed almost half of the all the writing tasks in the examinations.
