Complex sentence: In December 2007, Express Service was discontinued and (local) trains now run more frequently; weekday trains will run every 7--8 minutes, stopping at all stations, during rush hours and every 12 minutes during the midday hours.
Split into simpler sentences: In December 2007, Express Service was discontinued and (local) trains now run more frequently. Weekday trains will run every 7--8 minutes, stopping at all stations, during rush hours and every 12 minutes during the midday hours.