Complex sentence: The Zhihua Si Temple became a nationally preserved cultural and historic relic in 1961 and in 2005 the Chinese government renovated the temple in preparation for the numerous international visitors expected at the time of the 2008 Summer Olympics.
Split into simpler sentences: The Zhihua Si Temple became a nationally preserved cultural and historic relic in 1961. In 2005 the Chinese government undertook a renovation of the temple in preparation for the numerous international visitors expected at the time of the 2008 Summer Olympics.