The phrase "a major factor during" is correct and usable in written English.
It can be used when discussing the significance or influence of something within a specific time frame or event.
Example: "Economic stability was a major factor during the country's recovery after the recession."
Alternatives: "a key element throughout" or "a significant influence during".
For the reasons mentioned above, the chart is by no means proof that supply was a major factor during the recession.
In the role of Nancy Earl, Jordan's longtime friend and companion, Debra Cerruti suggests that the two shared a deeply loving and mutually supportive relationship, a major factor during Jordan's long battle with multiple sclerosis.
This indicates that the political saliency of reducing CC is not a major factor during public decision-making processes of supporting or opposing renewable energy policies in Mexico.
So-called "superdelegates" were a major factor during the 2008 nominating contest, with Clinton amassing an early lead among her congressional colleagues and national Democratic officials who participate in party conventions.
DCS was a major factor during construction of Eads Bridge, when 15 workers died from what was then a mysterious illness, and later during construction of the Brooklyn Bridge, where it incapacitated the project leader Washington Roebling.
Size increase does not appear to have been a major factor during Carnian times in this region of Pangaea.
The quality of seed stock was a major factor for variability during the NaCl greening assays.
The latter observations argue in favour of haemodynamics as a major factor causing AKI during MV.
Submarines first became a major factor in naval warfare during World War I (1914 18), when Germany employed them to destroy surface merchant vessels.
Some of the strongest evidence for the benefit of incarceration came from studies by a University of Chicago economist, Steven D. Levitt, who found that penal policies were a major factor in reducing crime during the 1990s.
Small, heat-seeking, shoulder-fired antiaircraft missiles first became a major factor in land warfare during the final stages of the Vietnam War, with the Soviet SA-7 Grail playing a major role in neutralizing the South Vietnamese Air Force in the final communist offensive in 1975.
