Complex sentence: These marches brought to a halt several major arteries in southern Colombia in which the government claimed there was FARC-EP involvement, although it has not been fully investigated what, if any, specific involvement the group had.
Split into simpler sentences: These marches brought to a halt several major arteries in southern Colombia. The government claimed there was FARC-EP involvement, although it has not been determined what, if any, specific involvement the group had.