The phrase "active once again" is correct and usable in written English.
It can be used to indicate that something that was previously inactive is now functioning or in operation again.
Example: "After a long hiatus, the project is active once again, and we are ready to move forward."
Alternatives: "operational once more" or "functioning again".
If I can give them a song to sing as they leave the theatre and become active once again, that's a good thing".
He became politically active once again in 2003, after the end of his five-year ban, and worked with the pro-Islamic Felicity (Saadet) Party.
Mexico's famous "volcano of fire" has been active once again, this time spewing ash two miles (3km) into the sky in the latest video from the west coast of the country.
However, while supporters heaved a sigh of relief that last season's leading scorer would be staying on Tyneside, manager Alan Pardew revealed that the clause would become active once again next month.
The Blues are among a series of clubs to have been linked with the former West Ham centre-forward, who scored his 12th and 13th goals of the season at Arsenal on Saturday, with the £7 million release-clause in his contract due to become active once again on Tuesday.
Central Chilean volcanoes became active once again around 2.5 mya, and have erupted almost continuously since.
The improvement in the debt markets has also helped the private equity industry — largely relegated to the margins in 2009 — assert itself as an active presence once again.
He wanted to not only watch life passing him by, but to be active and engaged once again.
New Yorkers, by their active self-mythologizing, are once again marketing their city to outsiders -- and trying as well to reassure themselves.
Their resignations were rejected, and by January 1917 they were once again active within the lodge.
