The phrase "has developed so much" is correct and can be used in written English.
It is typically used to describe something that has undergone significant growth, progress, or change. Example: "The city has developed so much over the past decade, with new skyscrapers and businesses popping up everywhere."
"He has developed so much in his game over the last number of years," director of rugby Conor O'Shea said.
Freeman has "developed so much respect [for Williams], after seeing how hard she works, that I would go out of my way to give her that advice" in the future.
In addition, in some parts of the world the street art culture has developed so much that not only are there just a few murals scattered around the city but also festivals and various events and contests are organized from time to time completely dedicated to that culture.
Figure 6 neatly illustrates why C-radical chemistry has developed so much more fully.
I've developed so much as a player over the last two or three years and last summer I got to No 3 in the ICC's batting rankings.
By 2030, China will have developed so much that it is expected to overtake the US to become the world's biggest oil consumer.
But I think they'll be dark horses, having developed so much in the last year and with so many depleted opponents.
Arnberg told Komet that given that the internet shopping market had developed so much over the past couple of years, it was a sign of the times that "boo.com will be relaunched in 2007".
The cameras on Smartphones have developed so much that they've largely crushed the small point-and-shoot camera market, which is disappearing.
Some people, in fact, have developed so much skill at looking like they're busy and like they know what they're doing, that honing that skill becomes a more important survival technique than actually getting better at what they're actually supposed to be doing.
