The part of the sentence 'has seen a large increase' is grammatically correct and can be used in written English.
You can use it to describe a change or trend that has occurred. Example: The number of tourists visiting our city has seen a large increase in the past year, leading to a boost in the local economy.
This semester has seen a large increase in the use of H2O at HLS, after a trial beginning last semester.
Nitza Spiro, director of the Spiro Ark school, says she has seen a large increase in the number of people wishing to learn both biblical and modern Hebrew.
Guatemala, however, has seen a large increase in apprehensions of minors of the border, reaching a high of just over 22,000 in 2018, the largest of any country within the past five years.
Julia Buckingham Edelmann, a Chicago interior designer, said that over the last few years she has seen a large increase in clients who want to decorate and design spaces for their teenage children, and a concurrent decline in interest in the multipurpose great room.
The charity ChildLine says it has seen a large increase in the number of children contacting it with concerns about online bullying.
This has continued a trend that has seen a large increase in the number of offenses since the murder of MP Jo Cox in 2016, one week before the referendum vote itself.
Only Africa has seen a larger increase in deployments over the same time span.
Recent developments have seen a large increase in interest in woodland restoration and a dramatic increase in regeneration and woodland spread.
Steven Cataldo, a Smithtown architect, said he had seen a large increase in the last few years in the type of businesses that wanted drive-throughs.
Happily, we have seen a large increase in access to postsecondary education for black and Latino students, but access to a separate and unequal system is no gift.
