Complex sentence: On 24 December 2014, Amnesty International reported that the unit is blocking humanitarian aid from Ukraine reaching the population of the separatist-controlled areas; over half the population in these areas depend on food aid.
Split into simpler sentences: On 24 December 2014, Amnesty International reported that the unit was blocking humanitarian aid from Ukraine reaching the population of the separatist-controlled areas. Over half the population in these areas depend on food aid.