The phrase "acknowledged a long time" is correct and usable in written English.
It can be used when referring to something that has been recognized or accepted for an extended period.
Example: "The scientific community has acknowledged a long time the importance of climate change research."
Alternatives: "recognized long ago" or "accepted for a long time".
Marketing as well as semiotics literature have therefore acknowledged for a long time that the graphic design of a package is a critical tool for managers to use to communicate about their brands.
And agribusiness has acknowledged for a long time that immigrants, many of them undocumented and the parents of Dreamers, are essential to creating this bounty.
The meiofauna (usually defined as the smaller size class of animals and protists passing through a 1 mm sieve and retained on a 63 µm or 32 µm sieve) communities and distribution have been much less studied at vents, although their importance in marine ecosystems has been acknowledged for a long time [39].
It is has been acknowledged for a long time that chronic inflammation in Crohn's disease is associated with the overproduction of proinflammatory cytokines.
Dioscorea alata breeding programmes were exclusively based on the creation of diploid varieties until 2006, although polyploidy has been acknowledged for a long time (Ramachandran, 1968; Abraham and Nair, 1991).
He acknowledged ratification takes a long time in France, but said that it was likely to happen by the summer.
A top TEPCO official acknowledged it could take a long time to clean up the complex.
However, the prime minister insisted that the success of justice policies should not be measured on the amount of money spent, but acknowledged it had taken a long time to address failings in the prison system.
PC was acknowledged as being important a long time ago in Turkey but its implementation has only recently become effective.
