The phrase "remained so that" is correct and usable in written English.
It can be used to indicate a condition or purpose that allows something to continue in a certain state.
Example: "He remained so that he could help his friends with their project."
Alternatives: "stayed in order to" or "continued so that".
He went on: "We recognise that some hangovers of the cold war remain, so that suspicion goes with the territory.
"I just want it to remain so that other generations will see this horrible place, where we were tortured.
Children already living in the houses were encouraged to remain, so that their blood could be analyzed.
The protections should remain, so that the species can continue its recovery and expand its range, just as the bald eagle and the alligator were allowed to do.
He argued that it was "very important" that Cameron remain, so that there is a period of stability, and an experienced team to deal with the renegotiation.
Again these crocus corms are undergoing advance planning for next spring and their foliage must remain so that their new flowers are formed.
She wants to leave Iran so that their daughter can have a better life, but he feels obliged to remain so that he can care for his father, who has Alzheimer's.
After Judge Glasser said that the proceedings on Tuesday would be closed, Mr. Lerner asked him to reconsider, saying, "We ask for the opportunity to remain so that we can challenge the government's representations".
Third, though each recollapse would destroy the components of the universe, the radiation would remain, so that each successive cycle would add to the total.
With the main app free and dedicated to remaining so, that business model will be based on licensing its encryption and self-destructing technologies to other messaging apps.
