"extensive developments" is correct and usable in written English.
You can use it to describe a wide range of situations, such as the broadening of a particular field of knowledge. For example, "The scientist's extensive developments in the field of AI have been revolutionizing the world of technology."
"This town has suffered from extensive developments of the wrong sort," he says.
But the Bulgarian government's failure to enact regulations outlawing extensive developments in such areas has allowed coastal constructions to go ahead almost unhindered.
In the past, we have seen extensive developments in computational applications in order to improve the efficiency of a design process — e.g. FEA; CAD/CAM; and virtual modelling.
Further, numerous benzothiophene-based compounds as clinical drugs have been extensively used to treat various types of diseases with high therapeutic potency, which has led to their extensive developments.
The use of computers in building design analysis has included extensive developments in structural analysis as well as programs for the analysis of the HVAC and environmental performance of buildings.
Extensive developments in molecular design of biomaterials have facilitated identification of several biophysical and biochemical variables (e.g. adhesion peptide density, substrate elastic modulus) as being critical to cell response.
That neighborhood, which also hugs the water, has undergone fairly extensive development since the Hudson Yards rezoning and the extension of the No. 7 subway line.
He insists on five-week rehearsal periods and extensive development workshops.
The highlands, which attract nature lovers from around the world, have limited protection and is potentially facing extensive development.
Tōkai's most extensive development occurred during the 1950s and '60s.
The islands have been subject to extensive development as their government has aimed to turn them into a sunshine paradise for wealthy holidaymakers.
