The phrase "and it has required" is correct and usable in written English.
You can use it to indicate that something has necessitated a certain action or condition in the past and continues to have that requirement.
Example: "The project has been challenging, and it has required a lot of teamwork and dedication from everyone involved."
Alternatives: "and it has demanded" or "and it has necessitated".
Mr. Tharoor has been a loyal United Nations man for most of his adult life, and it has required every creative power you can think of.
And it has required considerable discipline not to lean forward, like many an impatient passenger, and bark out directions for a faster alternate route.
Nor can owners simply keep driving their diesel after the juice runs dry: the E.P.A. thought of that, too, and it has required models to shut themselves down after a certain number of starts if owners ignore low-fluid warnings.
Completed in 1890, this was Britain's first major steel bridge and, although it has required a full-time maintenance team to look after it, its value remains undimmed.
Yale's Web site says it conducts criminal background checks of its employees, and since 2007, it has required all educational and employment credentials be verified.
Jimmy Bradley, an owner of the Mermaid Inn, believes the restaurant's $15 markup can only work in a casual neighborhood like the East Village, and even so, it has required him to make other compromises.
But contemporary art can be expensive, to compensate for the hours and hours of work it has required.
While the government has worked with the industry on a voluntary basis to study as many 2,000 chemicals and phase out certain ones, it has required the study of only 200 chemicals and restricted the use of only 5 since 1976.
The advantages are obvious, in efficiency and in saving paper, but it has required a leap of faith, too.
It has required long and patient negotiation to get to the point of having standard operating procedures.
It has required hours and hours of reporting time, countless freedom of information requests, many miles of travel across the United States to uncover stories firsthand, and rigorous analysis.
