The phrase "became improved" is grammatically correct and can be used in written English.
It is typically used to describe when something or someone has improved or become better over time. Example: After receiving additional training, her performance in the workplace became improved.
By then she was being wooed by directors from the Museum of Modern Art and elsewhere, though Claribel's will stated that the collection should be given to the Baltimore Museum "if the spirit of appreciation of modern art in Baltimore becomes improved".
Narrower the rib width is, performance of a cell becomes improved in the range investigated.
After gamma irradiation, the DO value of the effluent becomes improved and approaches to the standard value (4.5 8 ppm) for irrigation water (GoB, ECR 1997).
The final cause of this contest amongst the males seems to be that the strongest and most active animal should propagate the species, which should thence become improved.
Experimental study revealed that the NiMnGa-FSMAP/epoxy smart composites exhibit both tensile ductility and SME, and that shape memory properties become improved by decreasing particle size of FSMAP.
The theoretical fitting becomes improved with increased size N, and it is very good for N = 100 within the range of U = 20 intercross generations.
The western extension of the Genesee Road to Buffalo soon followed suit and also became an improved Macadam toll road, the Ontario and Genesee Turnpike, in 1805.
Four races into the season at the Indianapolis 500, they switched to Honda, and results became to improve, but at there were some costs involved in that.
Even Electronconvulsive Therapy (ECT) has become vastly improved since the early days when the descriptions had visions of Frankenstein dancing in our heads.
