"Combined efforts" refers to the collaboration and teamwork of multiple individuals or groups working together to achieve a common goal. Full definition
The beauty of online marketing, and websites, is that you can gather lots of information with combined efforts of targeted offline marketing. (attorneysonlineinc.com)
Players could venture alone, or combine their effort with three others, to defeat the game. (slickstermagazine.com)
It is hoped that this can be achieved through combining the efforts of researchers, pharmaceutical, biotechnology, and transport industries. (sciencemag.org)