The phrase "also a substantial role" is correct and usable in written English.
It can be used when discussing the importance or significance of a particular role in a context, often to emphasize that it is not the only role but still important.
Example: "In addition to her leadership position, she plays also a substantial role in mentoring new employees."
Alternatives: "also a significant role" or "additionally an important role".
LW radiation is an essential component of thermal balances in the atmosphere, playing also a substantial role in the design and operation of solar power plants.
Indeed, the Four City study [58], [97], numerous observational studies [101], a modeling study [90], and the striking magnitude of protection against HIV infection reported in three randomized trials of male circumcision [102], [103], [104], suggest also a substantial role for the lack of male circumcision in explaining the differences in HIV prevalence.
The global recession also played a substantial role in the decline of industrial activity.
As Mr. Balz and Mr. Johnson see it, Bill Clinton also played a substantial role in derailing Mrs. Clinton's campaign.
Mr. Sandler said Democratic leaders in Congress also played "a substantial role" in shaping party advertisements and deciding where they should run.
Some countries, including the Netherlands, were reluctant to give such a guarantee without knowing that private sector investors would also play a substantial role in the new bailout.
Some countries, like the Netherlands, were reluctant to give such a guarantee without knowing that private-sector investors would also play a substantial role in the new bailout.
Cardno Entrix also played a substantial role in organizing the public hearings on the project for the State Department, the last of which was held Friday in Washington.
CXCR4 also holds a substantial role in various pathological conditions and represents a highly attractive therapeutic target.
The results for student time use also reveal a substantial role for the time-varying family environment.
