The phrase "a significant effort is" is correct and usable in written English.
You can use it when discussing the amount of work or resources required to achieve a particular goal or outcome.
Example: "A significant effort is needed to complete the project on time, considering the tight deadlines and limited resources."
Alternatives: "a considerable effort is" or "a substantial effort is".
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.
A significant effort is the presence of 200 of those troops assigned as trainers across Central America.
With a potential big reward in sight, a significant effort is easier to justify, and people across functions and levels are better able to support it.
Since photic interactions are strongly wavelength-dependent, a significant effort is being devoted to assess the relative merits of the spectra of the different types of light sources available for use at home and in the workplace.
A significant effort is also being carried out on the development of suitable acceptance criteria for the divertor plasma-facing components and on the support to the design activities.
A significant effort was carried out as well to reduce the temperature sensitivity of the most critical devices.
In addition, a significant effort was made to analyze which form of Aβ (monomer, dimer or higher aggregates) that was most efficiently captured by the selected Affibody ligand.
A significant effort was made to interview respondents in person at their place of residence (86% of cases).
A survey of research publications in 1980 showed that a significant effort was spent on crop improvement, production technology, diseases and pests, and fertilization and seed technology.
Throughout the training and the intervention a significant effort was made to encourage facilitators to recognize the importance of this sort of participatory experience for young people.
