The sentence 'improvements were implemented' is correct and usable in written English.
You can use this sentence when discussing changes that have been made to a system or process, or when discussing steps that have been taken to improve something. For example, "The company recently made several improvements to the sales process. These improvements were implemented to increase efficiency and maximize profits."
Many improvements were implemented as a result of this experience.
Several improvements were implemented in this new Baseline, most notably the release of freeboard data within the Level 2 products.
Thorough EPP parametric analyses revealed dominant effect of gaps around EPP and several EPP design improvements were implemented as the outcomes of the analyses.
A holistic approach, comprising passive, integrated and active safety, was used and the proposed improvements were implemented in a demonstrator created from a normal production MP3 baseline.
After the improvements were implemented in the communication technologies and the wide access of civilians to internet and smartphones, newer players came to the competition.
During the conduction of the pilots, many improvements were implemented in the projects, including during projects execution, requiring some rework by the project managers and the development team.
Although the algorithm is similar to the original Morgan canonical code [21], various improvements are implemented to improve performance.
Some targeted improvements are implemented, extending both methods to address limitations identified that impair their scalability, improving their ability to extract potential pathways over large-scale databases.
It will need a higher level of outlays to correct accumulated deficiencies, and there's no guarantee enemies won't attack before improvements are implemented.
As more data become available, methodological improvements are implemented and the three approaches to GDP - output, income and expenditure - are fully balanced, further revisions can occur.
Mostly, such improvements are implemented at hazardous locations - road sections and junctions, which are associated with higher accident numbers and sometimes are termed "black-spots".
