Complex sentence: Following the installation of Soviet rule in 1920, the religious distinction among the population was no longer officially recognized, but ethnic distinctions on passports allowed many Chala Jews to continue being counted among the local Uzbeks and Tajiks, rather than Jews.
Split into simpler sentences: Following the installation of Soviet rule in 1920,, the religious distinction among the population was no longer officially recognized. Nevertheless, ethnic distinctions on passports enabled many Chala Jews to continue being counted as ethnic Uzbeks and Tajiks, rather than Jews.