Complex sentence: There have been two tiger attacks at the San Francisco Zoo, both involving a 4-year-old Siberian tiger named Tatiana (June 27,2003--December 25,2007).
Split into simpler sentences: There have been two tiger attacks at the San Francisco Zoo, each involving a 4-year old Siberian tiger named Tatiana. One was on (June 27,2003 & mdash and the other on December 25,2007).