The phrase "significant effort was" is correct and can be used in written English.
It is usually used to describe a considerable amount of effort that was put into something. Here is an example: "Significant effort was put into organizing the charity event, and it turned out to be a huge success."
Donen's next significant effort was Arabesque (1966).
Although hip-hop has been a dominant musical genre for more than a generation, it has had little impact on Broadway: other than "In the Heights," which ran for three years, the only significant effort was "Holler if Ya Hear Me," from last year, based on the lyrics of Tupac Shakur, which closed after six weeks.
"The full extent of any errors in the calculation and payment of royalties has been been quantified," the report said, adding that "significant effort" was required to resolve the status of another $281.4m in operating expenditure deductions and $21.1m in capital expenditure deductions.
Significant effort was necessary to arrive at consistent inelastic modeling assumptions for various structural details as will be discussed later.
Finally, significant effort was necessary to upgrade the existing teaching material to the level of the new tools.
Significant effort was dedicated to identifying the molecular regulators of these processes and the developmental defects resulting from gene modifications.
A significant effort is the presence of 200 of those troops assigned as trainers across Central America.
However, significant effort is further necessary before deploying a system for large-scale real applications.
In this paper a significant effort is made to quantify analyzability using object oriented software.
A significant effort is underway to develop biofuels as replacements for non-renewable fossil fuels.
Significant effort is occurring to replicate 'community based participatory integrated watershed management' activities in weredasa of most regions.
