Complex sentence: Further mass killings followed; at Dalj, north of Vukovar, where many inhabitants were previously massacred, numerous prisoners from Vukovar were subjected to harsh interrogations, beatings and torture, and at least 35 were killed.
Split into simpler sentences: Further mass killings followed; at Dalj, north of Vukovar, where other inhabitants had been previously massacred in the past. Numerous prisoners from Vukovar were subjected to harsh interrogations, beatings and torture, and at least 35 were killed.