The phrase "as formerly established" is correct and usable in written English.
It can be used to refer back to a previously set standard, rule, or agreement.
Example: "The committee will proceed with the project as formerly established in the last meeting."
Alternatives: "as previously established" or "as earlier determined".
The RTP was formerly established in 2007 but evolved from local initiatives commissioned previous to this.
16 The complex exercise program was based on a formerly established effective exercise program.
More importantly, our results reveal for the first time phylogenetic structure for Cerapachys by identifying a series of independent lineages formerly assigned to the genus as well as establishing some relationships among these lineages.
He has pulled that off even as big, established media companies — the world he formerly inhabited — have focused on packaging their shows and movies for viewing on the Web rather than making many creative inroads in original Web programming.
This situation is increasingly common as plantations are often established on formerly cultivated or grazed land.
These lands were formerly part of the Cattaraugus Indian Reservation, as established by the New York Treaty of Big Tree (1797).
However, this election is different as it only had two candidates, none of them from the established formerly big parties, and people from all different political parties had to choose.
When the Getty Information Institute (formerly the Art History Information Program, established in 1983) was dissolved in 1999 as a "result of a change of leadership at the Getty Trust, GRII absorbed "many of its functions".
The African-based Dimension Data, formerly known as MTN Qhubeka, have established themselves as a leading team in major tours.
Colorado's Contemporary Dance powerhouse Wonderbound (formerly known as Ballet Nouveau Colorado) has established itself as a major force with a variety of successful collaborations.
