Complex sentence: In that period, the JNA made only modest advances, capturing Antunovac located south of Osijek on 5 December 1991 and on the following day it pushed Croatian troops out from Tenja, within of the city.
Split into simpler sentences: In that period, the JNA made only modest advances, capturing Antunovac located south of Osijek on 5 December 1991. On 6 December, the JNA pushed Croatian troops out from Tenja, within of the city.