Complex sentence: The use of flood barriers has resulted in multiple disputes between people on the different sides; those on the flooded side being angry that they were unfairly affected, and often attempting to sabotage the barriers, sometimes resulting in armed confrontation.
Split into simpler sentences: The use of flood barriers resulted in several disputes between people on the different sides. Those on the flooded side were angry that they were unfairly affected, and often attempted to sabotage the barriers, sometimes resulting in armed confrontation.