The phrase "a complaint asserting" is correct and usable in written English.
You can use it when referring to a formal expression of dissatisfaction that includes a claim or statement of fact.
Example: "The plaintiff filed a complaint asserting that the defendant had breached the contract."
Alternatives: "a grievance stating" or "a claim alleging".
A decade ago a group of women from Haverhill filed a complaint asserting they were denied full membership and weekend tee times at the club.
To avoid charges of improperly working with Mr. Portman, the group used only publicly available footage of the candidate — yet Democrats still filed a complaint asserting that the advertisements crossed the line.
PAGE 34 Transit Union's Next Move The transit union, still in contract talks, intends to file a complaint asserting that transportation officials cannot insist it accept less generous pensions for future workers.
The first dot-com unionization vote has been called off after the Northern California Media Workers filed a complaint asserting unfair labor practices by the target of the union effort, etown.com.
[C13.] Vote on Dot-Com Union Postponed The first dot-com unionization vote has been called off after the union filed a complaint asserting unfair labor practices by the target of the organization effort, Etown.com.
Last Oct. 31, Ms. Booker called New York City police officers to her Bronx apartment, and she eventually swore out a complaint asserting that David Johnson had choked her, ripped off her clothes and shoved her into a mirrored dresser in the bedroom she shared with him.
In May 1998, the government and a group of states filed a separate broader complaint asserting a raft of antitrust violations.
The state's Board of Medical Examiners said this week that it would issue a formal complaint, asserting that some of those he has approved to use marijuana did not qualify under the law.
When the colonel resigned as chief military prosecutor, officials disclosed that he had filed a formal complaint asserting that General Hartmann improperly pressed for more war crimes cases and demanded "sexy" cases that would excite the public.
Common Cause, which said it got some of the documents from a whistle-blower and others from public record requests in state legislatures, is using the files to support an Internal Revenue Service complaint asserting that ALEC has abused its tax-exempt status, something ALEC denies.
The late Sen. Frank Lautenberg championed Voice for New Jersey's complaint, asserting that WWOR "must devote a specific and substantial amount of airtime each week to New Jersey news stories and events".
