The phrase "a relatively modest role" is correct and usable in written English.
It can be used to describe a position or function that is not overly significant or grand in nature, often in comparison to other roles.
Example: "In the project, she played a relatively modest role, mainly assisting with research and data collection."
Alternatives: "a fairly minor role" or "a somewhat limited role".
A scholarly consensus has emerged that the containment policy developed by the liberal Truman Administration was a major factor in the demise of the Soviet Union, and that Reagan-era militarization played a relatively modest role.
But when you talk to Republicans on Capitol Hill today, it sounds as if health care will play a relatively modest role in the campaign they plan to run.
Up until now, Mr. Bloomberg has played a relatively modest role in politics outside New York, occasionally donating to causes or candidates he favors or holding fund-raisers in his Manhattan town house to support them.
Just about everybody gets a chance to sing in the spotlight, which means that the book, by the veteran Thomas Meehan ("The Producers," "Hairspray") and Peter Stone (who died in 2003), plays a relatively modest role in this music-rich musical.
Shortly before the 12th century the Germans played a relatively modest role in the north European trade.
Part of the difficulty in detecting a gene encoding IMP cyclohydrolase activity on the basis of genome gazing is that the IMP cyclohydrolase enzyme has a relatively modest role to play in the catalysis.
And given his bank's relatively modest role in the credit crisis, he sees little reason that it should.
Rosneft's president and chairman, Igor I. Sechin, has ambitions to expand the company's current relatively modest role in natural gas, challenging the monopoly of state-controlled Gazprom, with the apparent support of President Vladimir V. Putin.
The sequel, which cost a relatively modest $30 million to make, stars Kevin James reprising his role as a security guard.
