The phrase 'complement the efforts' is a correct and usable phrase in written English.
You can use this phrase when you want to refer to how something contributes to something else, or how one thing enhances or adds to another. For example: "We are grateful for the volunteers' efforts to organize the fundraiser, and our grant funding will complement their efforts."
They will complement the efforts of the Angolan government and work closely with the World Health Organisation and other international partners on the ground to deal with the yellow fever outbreak.
Some people in the development community regard the increasing influence of private foundations as a threat to the bank's position, but Wolfowitz believes that private capital can complement the efforts of aid agencies.
An emergency meeting last weekend passed a resolution by an overwhelming majority to complement the efforts of the college deans with a robust call to action of its own.
Only recently have feminist groups like the Women's Rights Union, which grew out of a more broadly based civil-rights group, begun to appear, to complement the efforts of women's-development groups that promote, among other things, education, health, and income-generating schemes.
And though Syria's embattled president, Bashar al-Assad, may not participate, the crisis in Syria will be on the agenda and may culminate in a new Nonaligned Movement mediation push to complement the efforts of both the United Nations and the Organization of the Islamic Conference.
We believe that RepTB may complement the efforts towards alternate process of drug discovery by predicting hidden drug-target associations.
However, it is significant to mention that development of non-farm activities should complement the effort to develop agriculture, since activities in the former depend directly or indirectly on the later.
The delivery of basic teaching supplies and vocational training for adolescents will complement the effort in 2008.
Table 3 introduces main provider payment methods used in the three cities, and other key measures adopted to complement the effort of cost control.
To complement the effort of the C. elegans community, we took advantage of the balancer system, which was developed 30 years ago for capturing and maintaining lethal mutations, with the next-generation DNA sequencing technologies.
Provision of LLINs and their effective use would complement the effort as IPT in schools [ 59, 60] could be irrational today given the cost of the new malaria drug compounds and the need to prevent rapid emergence of resistance resulting from drug abuse.
