The phrase "a lengthy pattern of" is correct and usable in written English.
It can be used to describe a prolonged or extended series of occurrences or behaviors that follow a specific trend or style.
Example: "The study revealed a lengthy pattern of behavior that indicated a significant change in consumer preferences over the years."
Alternatives: "an extended series of" or "a prolonged trend of".
When the people of a community are terrorized by a lengthy pattern of horrific acts committed by members of an organized group whose intent is to dominate the streets, that is terrorism.
According to the forty-three-page indictment, Blankenship engaged in a lengthy pattern of deception in dealings with federal mine regulators, in an effort to cut costs, and, consequently, exposed his employees to appalling risks.
Did you know that Bob Knight had engaged in a "lengthy pattern of troubling behavior?" Myles Brand, the university president, and John Walda, the president of its board of trustees, sat through a news conference with straight and solemn faces and claimed this was news to them.
Mr. Nakoula was charged with eight probation violations, including lying to law-enforcement officers when they initially detained him for questioning, and using various aliases, which an assistant United States attorney, Robert Dugdale, said was "part of a lengthy pattern of deception".
The Oakland department remains under federal oversight as part of a settlement that stemmed from a civil lawsuit accusing officers of a lengthy pattern of police brutality and racial profiling.
Toyota's recalls and disclosures in recent months are part of a lengthy pattern in which the automaker has often reacted slowly to safety concerns, in some instances making design changes without telling customers about problems with vehicles already on the road, an examination of its record shows.
The group president, Deborah Slinkosky, said the plan appeared to be in a lengthy holding pattern.
Instead, it tracked the consumption patterns of a large population over a lengthy period of time to see who was more or less likely to develop diabetes.
