Complex sentence: By February 20 there were reports of snipers appearing on rooftops, this lead to perhaps the most bloody standoff of the revolution which resulted in over 100 sniper deaths of which SBU is also suspected of covering up.
Split into simpler sentences: By February 20 there were reports of snipers appearing on rooftops. This led to perhaps the most bloody standoff of the revolution, which resulted in over 100 sniper deaths of which SBU is also suspected of covering up.