The phrase "after numerous years" is correct and usable in written English.
It can be used to indicate a significant passage of time before a particular event or outcome occurs.
Example: "After numerous years of research, the scientists finally published their groundbreaking findings."
Alternatives: "after many years" or "following several years".
Open to the general public, SIGGRAPH 2006's return to Boston after numerous years in Los Angeles heralds a renewed atmosphere of innovation and progress in the New England area.
At the end of the tour, I asked Reynders what responsibility the Belgians bear for the fact that the Democratic Republic of Congo has only a shaky peace after numerous years of civil war.
This 15th edition of MMM marks the return of the conference to Europe after numerous years of activity in Asia, and we are proud to have organized such a prestigious conference on the French Riviera.
I came back from the Netherlands, and she left me some chocolate-chip cookies and some cupcakes with a note that said, "Welcome back, here are American things to welcome you to America!" Finally, I just laid all my cards on the table, after numerous years together.
The company that owned our textbook operation also owned S&P, so we were included on the company-wide email announcing that after numerous years of valuable service, the president would be departing in order to spend more time with her family.
A belated national champion, after playing numerous years on the predominantly black American Tennis Association circuit, Gibson played a powerful, athletic serve-and-volley style.
A further complication is that breast cancers can give metastases even numerous years after removal of the primary tumor.
But eventually, after numerous billion years of expansion, the growing abundance of dark energy caused the expansion of the universe to slowly begin to accelerate.
Shelby disrupted the Obama administration as it entered its second year after numerous delays in appointments during the first year that are keeping holdovers in many key slots throughout government.
His elbow, after numerous bleeds over the years, gives him chronic pain.
The initiative comes after numerous attempts over the years by some state legislators, principally Republicans, to make possession of any amount of marijuana a crime.
