Complex sentence: The pavilion completed construction on October 2,2010, the bell was installed and dedicated on May 14,2011, and the official opening ceremony for the garden was held on May 19,2012.
Split into simpler sentences: The pavilion completed construction on October 2,2010, and the bell was installed and dedicated on May 14,2011. The official opening ceremony for the garden was held on May 19,2012.