The phrase "a main force behind" is correct and usable in written English.
It can be used to describe a significant contributor or driving factor in a particular situation or outcome.
Example: "The organization was a main force behind the successful implementation of the new policy."
Alternatives: "a key driver of" or "a primary contributor to".
"We didn't want anything too ooga-booga," said Fred Gretzon, a local businessman and practitioner of transcendental meditation who has been a main force behind the incorporation petition.
He is a major figure in Mr. Berlusconi's Forza Italia political party, and he is also a main force behind legislation to amend Italy's conflict-of-interest rules.
As a main force behind the successful American defense in 1992, and the dominating Kiwi challenge in 1995, Peterson has been on the winning side in every campaign since the International America's Cup Class boats replaced the 12-Meters.
She was also a main force behind the Urban Service Corps, which sought to apply volunteer efforts to the problems of large cities.
Mr. Connerly, a Republican, is the main force behind a hotly disputed ballot initiative banning the collection of racial data in California that had been scheduled for a statewide vote next March.
The array of agencies was a cover for the main force behind most of the busts: the Drug Enforcement Administration.
"I'm a bit nervous … I wouldn't call myself a risk-taker," admits Brandon Stell, a 41-year-old neuroscientist and the main force behind PubPeer, which has become an influential outlet for identifying flawed and sometimes fraudulent studies.
He is the main force behind a SuperPAC that invested heavily in Ted Cruz and others with extreme views, who have been the instigators of the shutdown.
Moreover, even if relative protection from DNA damage is a factor in the evolution of multicellular organisms, it could be an additional benefit, not the main force behind the emergence of either multicellularity or embryogenesis.
Its chairman, Lee Morgan, Antioch '69, is a retired printing magnate who drives a built-to-order British convertible, a Morgan Plus 8, and is the main force behind the Morgan Family Foundation, which has given $2.75 million to the new Antioch.
In addition, for most of the countries, a fall in the skill premium is the main force behind the decline in labor income inequality.
