The phrase "a longstanding and persistent" is correct and usable in written English.
It can be used to describe an issue, condition, or situation that has been ongoing for a significant amount of time and continues to exist.
Example: "The community has been dealing with a longstanding and persistent problem of inadequate public transportation."
Alternatives: "an enduring and ongoing" or "a chronic and continuous".
The letter said WellPoint had "demonstrated a longstanding and persistent failure" to comply with regulations and that its conduct had long been posing "a serious threat to the health and safety of Medicare beneficiaries".
The federal agency said WellPoint had "demonstrated a longstanding and persistent failure" to comply with regulations and that its conduct had long been posing "a serious threat to the health and safety of Medicare beneficiaries".
In 2009, the Centers for Medicare & Medicaid Services barred WellPoint, a major insurance company, from participating in Medicare Part D because WellPoint has "demonstrated a longstanding and persistent failure to comply with CMS's requirements for proper administration..."...
Implicit in these complaints, however, is an acknowledgement of the longstanding and persistent inequity in America's public schools.
For the Australian case, they are central, longstanding and persistent, and thus worthy of analysis; and they are applicable in general terms to other places with similar histories of settlement and land use.
Setting aside the word propaganda, I will readily assert that there has been a longstanding and well-financed effort to raise public concern by downplaying substantial, persistent and legitimate uncertainty about the worst-case outcomes from greenhouse-driven warming and over-attributing the link between such warming and climate-related disasters and other events.
A longstanding and still unresolved problem in the equatorial ionosphere is what triggers ESF/EPBs.
The addition of sulfur dioxide is a longstanding and common practice in the winemaking industry.
Fostering effective and efficient problem solving skills is a longstanding and universally agreed-upon educational goal (Huxley 1898; Kuhn 2005).
For the NIEHS, this is a longstanding and ongoing approach.
