Complex sentence: Then YB was moved to Stutthof, escorted Jews to Toruń, stayed there until in April 1944 received orders to convoy Jews to Bydgoszcz, but members of YB fled from arriving front and Jewish prisoners escaped.
Split into simpler sentences: Then YB was moved to Stutthof, escorted Jews to Toruń. However members of YB fled from the approaching front and Jewish prisoners escaped.