The part of the sentence 'has been gradually accepted' is correct and usable in written English.
You could use it to express that something has become more accepted over time, for example, "The belief that everyone should have equal rights, regardless of their gender, race, or sexual orientation, has been gradually accepted over the years."
Gene therapy, a significantly crucial strategy for treatment of malignancies, has been gradually accepted in recent years.
In recent years the concept of "organization" has been gradually accepted as a suitable abstraction for the development of open multi-agent systems with dynamic agents.
To develop a robust, reliable nuclear reactor system with minimal environmental impact and cost, modularity has been gradually accepted as a key concept in designing high-quality nuclear reactor systems.
IT'S a puzzle: one dispossessed group after another — blacks, women, Hispanics and gays — has been gradually accepted in the United States, granted equal rights and brought into the mainstream.
The site is now written and edited by tens of thousands of contributors around the world, and it has been gradually accepted as a largely accurate and comprehensive source, even by many scholars and academics.
It has been gradually accepted that MSI provides rich molecularinformation provided by this mass spectrometry imaging platform.
The most often repeated stories surrounding Shergar's death, while never proven, seem to have been gradually accepted in Ireland as the truth.
Holling (1973) creatively introduced resilience into the ecosystem stability and then the resilience research has been gradually recognized and accepted.
Among them, the fuzzy comprehensive evaluation method, which is strongly systematic and provides definite results, is accepted by many scholars and has been gradually improved over the years.
Payments platform Balanced has been gradually adding features to enable marketplaces to accept and make payments out to their users.
