Complex sentence: When armed conflict broke out after the pogroms, the OPON was deployed to crush initial Armenian resistance fighters, however, due to the OPON's poor quality of training and organization, they were driven back and defeated by Armenian rebels.
Split into simpler sentences: When armed conflict broke out after the pogroms, the OPON was deployed to crush initial Armenian resistance fighters. However, due to the OPON's poor quality of training and organization, they were driven back and defeated by Armenian rebels.