"much broadened" is correct and usable in written English.
You can use it when you want to express that something has been significantly enlarged or expanded. For example: "The company's product line has been much broadened to include items for all ages."
And that has made the books better and very much broadened the subject matter, too.
In many species of burrowing amphipods, the claws are reduced, but the adjacent segments are much broadened, strongly spined, and powerfully muscled.
No matter that the poem was penned 90 years ago by a nationalist poet and is taught in schools.And no matter, apparently, that the scope of free speech was much broadened by last month's constitutional changes.
For the case with control for the system, the applicability of the zero-order approximation coupling model can be much broadened.
Comparatively, the P3HT NWs shows a much broadened absorption curve with the response edge greatly red-shifted to about 650 nm.
In summary, today's digital library information system is to be seen from a much wider and more holistic perspective, and provided with a much broadened meaning to hold and put together all the print, digital and electronic information available and accessible to the library.
Such control over bundling would very much broaden the range of moduli and pore sizes that can be acquired using our fiber based gels.
Note that the NMR signals are much more broadened at 10°C, thus preventing further analysis.
The geometrical structures of the BPA-etched QRs still exhibited ring-shaped features, with a much more broadened and deeper central hole.
Txikito and El Quinto Pino in Manhattan, which make up the rest of their fleet, have done much to broaden the range of Spanish flavors in the city.
EMC has done much to broaden its base, buying companies like VMware and bolting onto its storage products things like the data analysis software of Greenplum, another acquisition.
