"were less active in" is correct and usable in written English.
For example, "Due to the storm, the birds were less active in the garden.
Second, beneficiaries also received less training, and this evidence is largely consistent with the idea that treated individuals were less active in job-searching (and training) activities because they already had a job.
The scans showed that areas of the brain involved in improvisation were less active in the more experienced pianists, perhaps because their brains were working more efficiently.
There were several dozen genes, however, that were less active in the lonely, and several dozen others that were more active.
They went on to work with many notable artists, including Jimmy Cliff, Shabba Ranks, Maxi Priest, Buju Banton, Heavy D and Billy Ocean, though they were less active in recent years once Clevie became chairman of the Recording Industry Association of Jamaica.
Internal oblique and RA were less active in EX.
Forty-four genes were more active and 193 were less active in the stool-derived sample.
While the supported gold catalysts are less active in H2 oxidation, they exhibit much higher activities in CO oxidation.
Interestingly, the MEK inhibitor trametinib appeared to be less active in patients whose tumours had MAP kinase activation by BRAF V600K (Margolin, 2012).
Badgers are less active in winter.
He was less active in the studio as the 1970s gave way to the '80s.
But one area that Activision Blizzard may be less active in is deal-making.
