"broaden their efforts" is correct and usable in written English.
You can use it to describe any situation in which someone is attempting to improve a certain area by taking additional steps. For example: "The teachers have decided to broaden their efforts to reduce student absenteeism by introducing a rewards system for students with perfect attendance records."
As China and other countries broaden their efforts to obtain Western technology, American industries beyond the traditional military and high-tech targets risk having valuable secrets exposed by their own employees, court records show.
The latest work suggests that conservation groups must broaden their efforts to protect nesting areas from development.
While a direct attack on the Fourteenth Amendment is fraught with unintended consequences, anti-choice activists have shrewdly chosen to broaden their efforts against health needs for women in open disdain.
Perhaps toxicologists and immunologists can also broaden their efforts to improve animal models of asthma development.
Existing community mobilization programs that have primarily focused on empowering FSWs should broaden their efforts to promote reproductive health in addition to the prevention of HIV among all FSWs, with particular emphasis on FSWs who experienced violence.
N.R.A. leaders say they plan on broadening their efforts.
C1 Military Insurance Inquiry State and federal investigators and members of Congress are broadening their efforts to address problems in the sale of life insurance and mutual funds to young soldiers and other service members.
Broadening their efforts to rein in California's power crisis, federal regulators today ordered that restraints on electricity prices be applied at all hours and extended to 10 other states across the West.
Speaking to BitTorrent news site TorrentFreak, The Pirate Bay also revealed that they would be broadening their efforts to fight web censorship and are reportedly working on "a special BitTorrent-powered browser, which lets users store and distribute The Pirate Bay and other websites on their own".
Federal lawmakers, bank regulators and law enforcement officials are broadening their efforts to ensure that the growing number of oil and gas leases being signed by landowners across the country comply with mortgage rules and do not create new risks for lenders, appraisers or landowners.
A3 World Briefing A8 NATIONAL A12-20 U.S. Widens Regulation Of Electricity in West Federal regulators, broadening their efforts to rein in California's power crisis, ordered that restraints on electricity prices be applied at all hours and extended to 10 other states across the West to prevent electricity suppliers from selling their power out of state to avoid the limits.
