Complex sentence: Within several minutes 27 people were killed; among them only eight were men of the "fighting age", meaning aged 14 to 60; in the next two weeks 21 more wounded died of their wounds.
Split into simpler sentences: Within several minutes 27 people were killed; among them only eight were men of the "fighting age", meaning aged 14 to 60. In the next two weeks 21 more wounded died of their wounds.