The sentence "There were several changes" is a perfectly correct and usable sentence in written English.
You can use this sentence when describing a situation in which several changes were made. For example: "There were several changes made to the company policy last week."
There were several changes in government.
There were several changes in the system that U.S.I. was working on.
The Communist party was in turmoil, and in the ensuing months there were several changes of party and government leaders.
With Michelin guides published earlier this year elsewhere in Europe, there were several changes in those three-star lineups.
"Negotiating a deal was difficult and expensive, and there were several changes of strategy on the fly," said Tim Harrington, the chief executive of FogDog Sports, another anchor tenant in the shopping channel.
It took them a good year and a half before they even played live, and the intervening years have not been spent idly – songs were written, an EP recorded, Wayman had a son (a fact that requires some logistical consideration now they are touring so widely) and, post-Sossamon, there were several changes of drummer.
While there were several changed to the playing staff, the core of the team that had played in the Second Division remained intact.
Assuming the Tories are not going to back down altogether, there are several changes that would make this policy more tolerable.
There are several changes of slope in the plots of plate number organized by size against plate size order which are discussed.
There are several changes that could improve these barriers to access including decreasing the frequency of mandatory password changes, less frequent timeouts, and integration of the PDMP into the electronic medical record (EMR).
Additionally, there are several changes in the presentation of these material properties as the dimensionality is altered from two- to three-dimensional substrates, which may fundamentally alter our understanding of substrate-induced mechanotransduction processes.
