The phrase 'has since prospered' is correct and usable in written English.
It can usually be used to indicate that something has become successful after a period of difficulty or struggle. For example, "Since its founding in 1975, the company has since prospered, and now generates millions of dollars in annual revenue."
But it has since prospered without such handouts, buoyed by the rest of the country's rapid growth.
There was a silver lining: She was pushed by circumstances to move to New York, where she has since prospered.
Although JLR has since prospered under Tata's control, the $1 billion of cash it ate up in the first year of its new ownership would have overwhelmed Mahindra, which then had a market capitalisation of only $4 billion.
Accountancy group Arthur Andersen became Accenture months after its role in the Enron scandal damaged its good name beyond repair and it has since prospered, but commercial considerations are not always the overriding factor.
The village has since prospered in a relative sense, with schools and a new way of life for many.
Following the Trafford Centre's opening in 1998, it was expected that the centre would suffer, but it has since prospered.
Some, such as Bermuda, have since prospered from finance and tourism.
The island may have since prospered, but the original islanders did not.The study paints the British as relatively benign rulers compared with the Iberians.
The timing was perfect: the merged groups, with their expertise in making high-grade steel products, have since prospered from booming car- and ship-building industries at home and, abroad, from a seemingly insatiable appetite for steel in China.
The following year, Pierre Omidyar, a French-born Iranian-American, put an auction site on the web that would become eBay.Even as hundreds of other dotcoms fell by the wayside at the turn of the century, these three made it through the great internet crisis and have since prospered, to varying degrees and at different times.
As Joshua Oppenheimer's documentary The Act of Killing shows, leaders of the death squads that helped murder a million people during Suharto's terror in the 1960s, with the approval of the west, have since prospered through other forms of organised crime, including illegal deforestation.
