Complex sentence: But the process was halted when Estrada, Buenaventura's primary supporter and appointing power, was booted out of office, to be replaced by vice president Gloria Macapagal-Arroyo who was catapulted by the opposition into power as the least offensive standard bearer.
Split into simpler sentences: But the process was halted when Estrada, Buenaventura's primary supporter and appointing power, was booted out of office. He was soon to be replaced by vice president Gloria Macapagal-Arroyo, who was catapulted by the opposition into power as the least offensive standard bearer.