Complex sentence: Several days after the incident, an envelope was received by the Syracuse, New York, TV station News 10 Now dated March 18,2009 and postmarked April 3,2009, the day of the shootings.
Split into simpler sentences: Several days after the incident, an envelope was received by the Syracuse, New York, TV station News 10 Now. Dated March 18,2009, it was postmarked April 3,2009, the day of the shootings.