"partnership expanded" is a correct and usable phrase in written English.
It can be used to describe a situation where a partnership between two entities has grown or increased. Example: The healthcare company announced that their partnership with local clinics had expanded, allowing them to reach more patients in need.
After bombings in Madrid and London, the partnership expanded.
In 1989, the partnership expanded to 11, and it hired John Furtado, a landscape architect from Seattle, who is a friend of a partner.
Later, the Partnership expanded by making arrangements directly with L.A. Unified.
In 2010, the partnership expanded southward to fit with the new organizational scale for ocean observing and regional ocean management in the United States (see Northeast Coastal and Ocean Data Partnership: http://necodp.org).
In 2009, the partnership expanded its scope to include all emerging infectious diseases.
In Burkina Faso, a research partnership has also been in place for several years with IRSS [Health Sciences Research Institute] and the French Institut de recherche pour le développement (IRD) [Research Institute for Development]; the fight against vitamin A deficiency was the main research topic until the partnership expanded to include the DBM in 2008.
The partnership expands the ability for Whistlestop to get seniors to the IOA's social day programmes, with Lyft providing wheelchair-accessible vehicles.
For J. P. Morgan, the partnership expands the company's reach beyond big institutional clients to individual investors without the risk of bungling a big deal.
Microsoft and Yahoo have been asked by the Justice Department for more information on a proposed Internet-search partnership, expanding the agency's review of the deal.
Like every other modern presidential couple, the Obamas have watched their world contract to one building and a narrow zone beyond, and yet their partnership expand to encompass a staff and two wings of the White House.
It hasn't yet, but I'd love to see this partnership expand to the app as well.
