The phrase "as long anticipated" is correct and usable in written English.
It can be used to indicate that something has occurred or been revealed after a period of expectation or prediction.
Example: "The results of the experiment were, as long anticipated, groundbreaking and transformative for the field."
Alternatives: "as expected" or "as previously predicted".
Now, despite splitting Iowa and New Hampshire, as long anticipated, Democratic frontrunner Hillary Clinton is suddenly doing the same thing.
This comes as long anticipated news after both companies balked at signing the international factory safety accord that major European retailers and other mega U.S. corporations joined quickly following the May collapse, citing liability concerns.
It will not, as comedians had long anticipated, be a four-bladed version (Schick-Wilkinson Sword reached that landmark first, in September 2003, and Gillette has taken it to court for its pains).
Before they moved in, they hired a cleaning company; it sent three people who took twice as long as anticipated.
The site itself was also plagued by technical problems and delays, and took twice as long as anticipated to develop.
Anyone who has ever had a kitchen remodeled knows that such projects almost always take three times as long as anticipated.
Arriving at double the estimated cost (£375m over budget) and taking twice as long as anticipated, the experience casts a shadow over other cities in the UK that want to set up tram networks.
Thus the expansion, so long anticipated as the fulfillment of dreams for half a continent oppressed during the Soviet era, had an ill-mannered side to it.
On one hand, the "formalization" of employment relations has not yet squeezed out traditional social ties, as modernization theory has long anticipated.
It later, as most informed observers had long anticipated, dropped out of the bidding for the 2018 Cup, accepting that the tournament is destined to take place in Europe.
It was a moment that, as Thorbjorn Jagland, chairman of the Nobel committee, said as he introduced her, had been long anticipated in Norway.
