The phrase "and subsequently announced that" is correct and usable in written English.
It can be used to indicate that an action was taken after a previous event, often in formal or informative contexts.
Example: "The company held a meeting to discuss the new policy and subsequently announced that it would take effect next month."
Alternatives: "and later declared that" or "and then stated that".
In August 2005, Eminem canceled the European leg of the tour and subsequently announced that he had entered drug rehabilitation for treatment for a "dependency on sleep medication".
In 1997 the Sony Corporation acquired all or some of McClory's rights in an undisclosed deal, and subsequently announced that it intended to make a series of Bond films, as the company also held the rights to Casino Royale.
It was subsequently announced that novelist Jane Austen would be the face of the new £10 from 2017.
Just last week the German 'startup factory' and e-commerce behemoth disclosed that it had invested in Take Eat Easy, which is active in Belgium and France, and then subsequently announced that it had acquired Germany's Volo, which recently expanded to Berlin.
Oklahoma businessman Mart Green subsequently announced that he and his family would donate a total of $70 million to the debt-ridden university, which was founded by and named after Roberts's father.
And the Scottish Championship outfit have subsequently announced that they will require further emergency funding during January.
Williams subsequently announced that Button was loaned out to Benetton and was still on contract with team.
Baron Cohen subsequently announced that he was "killing off" the characters of Borat and Ali G because they were now so famous he could no longer trick people.
REO subsequently announced that the previous plan by Parkview had been dropped and that it had appointed the practice of the Uruguayan-born architect Rafael Viñoly, of New York as the new master planner for the site.
The couple subsequently announced that they are divorcing.
De Villepin subsequently announced that immigration controls would be tightened.
