Complex sentence: Support from AKP endured in spite of the killings which were reported during Pol Pot's rule which AKP at that time considered to be a part of a smear campaign against the new rule, and AKP had delegations visiting the country.
Split into simpler sentences: Support from AKP endured in spite of the killings which were reported during Pol Pot's rule. At that time, AKP considered these reports to be a part of a smear campaign against the new regime, and AKP had delegations visiting the country.