Complex sentence: In May of 2015, Mayor Schaaf instituted a ban on nighttime protests in Oakland, CA, citing existing city policies that led to dozens of arrests at two protests on 5/22/2015 and 5/23/2015.
Split into simpler sentences: In May of 2015, Mayor Schaaf instituted a ban on nighttime protests in Oakland, CA, citing existing city policies. The ban on nighttime marches led to dozens of arrests at two protests that occurred on 5/22/2015 and 5/23/2015.