The phrase "make concerted efforts" is correct and usable in written English.
You can use it when you want to express that multiple parties are joining together to achieve something. Example sentence: We must make concerted efforts to protect the environment.
The "graying of the audience" is causing both to make concerted efforts to widen their appeal.
Speaking in Chicago in October 1937, he proposed that peace-loving nations make concerted efforts to quarantine aggressors.
In order to achieve this, the government must make concerted efforts to eliminate subsidies, reduce the wage bill and contain defence outlays.
With the government writing $5,000 checks to people who buy health insurance, one might have expected insurance companies to devise policies that cost exactly the amount of the credit and then to make concerted efforts to enroll people.
He further stated that the Chinese government is ready to make concerted efforts with the Bahamian government to build a China-Bahamas relationship of all-round cooperation in the interest of mutual development.
To respond to another string of comments: I do know that I'm sometimes recognized in restaurants, especially on second, third or fourth visits and especially in new, vigilant restaurants that make concerted efforts (rounding up old photos, eavesdropping on table conversations, etc).
And the art world makes concerted efforts at inclusivity.
People were afraid of the virus and governments made concerted efforts to contain Ebola's spread.
Around the world, cities are making concerted efforts to limit car use, whether through temporary events or new policies.
He countered with a subtle personality change, making concerted efforts to smooth his rough edges with players and reporters.
Over the past few years, economists have been making concerted efforts to value the natural world, and have made some headway.
