Complex sentence: Riverbend has announced they are building an additional 4,100 seat pavilion, The National City Pavilion, adjacent to the box office, and is it expected to open in June 2008.
Split into simpler sentences: Riverbend has announced they are building an additional 4,100 seat pavilion, The National City Pavilion. The new pavilion will be built adjacent to the current box office and is it expected to open in June 2008.