The phrase "a major process that" is correct and usable in written English.
It can be used when describing an important or significant procedure or series of actions that lead to a particular outcome.
Example: "The research outlines a major process that contributes to the development of renewable energy technologies."
Alternatives: "a significant procedure that" or "a key process that".
Given the fact that rounded grains returned by Hayabusa require a geological high-energy environment for their production and that YORP has the potential for repeatedly affecting the surfaces of asteroids over time whereas tidal disruption does not, we propose that YORP was a major process that helped produce and shape the regolith on Itokawa (Figure 1).
Several lines of evidence suggest that gene transcription is a major process that is regulated by O-GlcNAcylation.
Even if the second sentence might be correct, its association with the first one suggest that the authors tend to overlook the importance of recombination in prokaryotic genomes, a major process that is not tree-like.
Adaptation to distinct environments via natural selection is doubtless a major process that can drive species diversification [ 36], and it has deservedly received attention from both theoretical and empirical biologists (see [ 37, 38]).
As a consequence, genetic drift is a major process that reduces genetic variation.
Anaerobic process of organic matter degradation is the major process that contributes to energy generation.
UNICEF is committed to supporting this major process that the government of Zimbabwe has embarked upon.
Two major processes that contribute to the epigenome of a cell are DNA methylation and histone modifications.
Water rock interactions are major processes that control the solute transfer (from natural or anthropogenic sources) in aquifers.
The gravure printing process is one of the three major processes that are used for catalogs, magazines, newspaper supplements, cartons, floor and wall coverings, textiles, and plastics.
Above, I've outlined the major processes that go into the manufacture of your garden-variety consumer electronic product.
