The phrase "after he retained" is correct and usable in written English.
It can be used in contexts where you are discussing actions taken after someone has kept or maintained something, such as a position, information, or an object.
Example: "After he retained his position as team leader, he implemented several new strategies to improve productivity."
Alternatives: "after he kept" or "after he maintained".
Mr. Victor's feud with DLA Piper began after he retained the firm in April 2010 to prepare a bankruptcy filing for one of his companies.
Late Friday, Schleck exuded confidence after he retained the lead he built over Evans one day earlier with an audacious and early mountain attack.
In the feature, Larson took the lead from Peters on lap 39, and later battled with Dillon for the win, and Dillon claimed the victory after he retained the lead on the green white checker finish for his fifth career Truck Series win.
He presumably conformed to Protestantism, however, for after the Reformation he retained livings (benefices) in Essex and Somerset held since 1546.
Although Blackwell had his boxer's licence removed by the British Boxing Board of Control (BBBofC) after his ordeal, he retained a trainer's licence.
"Mick was without doubt, through his own efforts, the greatest wrestling name that the UK has ever seen or will see again, and even 25 years after his retirement, he retained his aura of stardom until the end".
While Bonnet set loose most of his prizes after looting them, he retained control of the last two ships he captured: the sloops Francis and Fortune.
After becoming disabled, he retained his title, with his successors being called "acting" or "deputy" presidential spokespersons. 5. What did Tesla and SpaceX CEO Elon Musk say could be "more dangerous than nukes"?
Daley was in ninth place, which he retained after the second round moving up to eighth after the third, seventh after the fourth and fourth after the fifth.
Gen. George McClellan named Buford his chief of cavalry, a position he retained after Gen. Ambrose Burnside assumed command.
He left the department to become chief of staff for Queensland opposition leader Wayne Goss a position he retained after Goss became premier of Queensland in 1989.
