"has been largely expanded" is a correct and usable phrase in written English.
You can use it to refer to something which has grown or increased significantly in size, scope, or importance. For example: "The library's collection of rare books has been largely expanded in recent years."
He has been largely responsible for expanding Chase's syndicated-loan business, helping finance blockbuster deals like last year's $34 billion takeover of Telecom Italia by Olivetti, and the pending $58 billion acquisition of the MediaOne Group, the big cable company, by AT&T.
Architectural professional education has been largely neglected in the expanding ESP literature, although the types of discourse that orchestrate professional training in this area have some interesting and unique features.
Harlem is hardly the only ethnic neighborhood to have metamorphosed because of inroads by housing pioneers seeking bargains and more space — Little Italy, for instance, has been largely gobbled up by immigrants expanding the boundaries of Chinatown and by creeping gentrification from SoHo.
The growth in the north east has been largely put down to the expanding oil and gas industry and the workers it attracts to the area.
The next step would be for President Bush, who has been largely indifferent to marine issues, to expand the network of reserves into adjoining federal waters, which begin three miles out to sea.
But in office, he has been largely defined by his efforts to expand the government's reach into the economy, health care and financial regulation — an agenda that has left him vulnerable to efforts by conservatives to portray him as far too left for the country.
Indeed one of the most extraordinary discoveries of the last years, which has been largely implemented in 2014 transforming and expanding our ability to model human diseases in animals, has been the CRISPR- (clustered regularly interspaced short palindromic repeat-) Cas9 (CRISPR-associated nuclease 9) system, an easy method to efficiently manipulate the genome of any organism [ 1, 2].
Until now, that kind of expanded home-security automation has been largely the domain of high-tech hobbyists.
There are relatively few suppliers, and there is a need to expand the skills-base, which has been largely lost in countries such as the UK.
Work in this area has expanded rapidly over the last decade and has been largely developed from an illness or medical perspective, emphasising tertiary and secondary-level interventions.
