Complex sentence: The shootings sparked the largest criminal investigation in Northern Ireland's history, which created fresh tension in Belfast as Republicans saw what they believed was a disparity in the efforts the RUC expended in investigating the corporals' murders compared with those of Republican civilians.
Split into simpler sentences: The shootings sparked the largest criminal investigation in Northern Ireland's history. Republicans claimed a disparity in the efforts the RUC expended in investigating the corporals' murders compared to deaths of republican civilians.