The phrase "as its longstanding" is not correct in English as it is incomplete and lacks context.
It could be used in a sentence where you are referring to something that has been established or in existence for a long time, but it needs additional information to be clear.
Example: "The organization is known for its longstanding commitment to community service."
Alternatives: "as its enduring" or "as its long-established".
We chose AM as a form of CAM with a European origin because of its well-known integrative care culture in theory, practice and medical training as well as for its longstanding experience in PGMT within the public healthcare systems in Germany and Switzerland.
Far and away the most surprising change here, as Apple abandons its longstanding proprietary connector in favor of something far more universal — and, as it happens, something that sends power both ways, making it possible to charge your phone and smaller devices with the iPad itself.
Over the coming years, as many of its longstanding dressmakers and seamstresses retire, the family-run business will find it hard to replace them so that the brand can continue making clothes in the UK.
As one of its longstanding activities, the WFCC participated in the development of the WFCC World Data Centre for Microorganisms (WDCM) in the late 1960s [ 1].
Despite some policy setbacks, the Government remains committed to trade and investment liberalization as part of its longstanding recovery programme that began in the mid-1980s andeepeneded in the mid-1990s.
But even as it takes comfort in its longstanding alliance with the United States, the Philippines, a former American colony, is eager to find common ground with its giant neighbor to the north, whose growing economic pull it is finding impossible to resist.
(Its longstanding grievance, as it happens, is that its members are paid less than teachers in schools).
Above all, if China refuses to abide by the verdict, it will be openly branded as an outlaw, undermining its longstanding claim to regional leadership as a responsible power.
Worse, it unseated Vogue from its longstanding position as the leader in design.
