Complex sentence: The "home" game sequences were filmed in Shea Stadium the filmmakers also used the walkway that connected the Mets clubhouse and 1st base dugout, the TV studio that was the home of "Kiner's Korner" post-game show for the singing scene.
Split into simpler sentences: The "home" game sequences were filmed in Shea Stadium. The filmmakers also used the walkway that connected the Mets clubhouse and 1st base dugout and the TV studio that was the home of "Kiner's Korner" post-game show for the singing scene.