Complex sentence: In April 2007, the Administration Council took office, between 2007 and 2009 personnel were employed and installations made on the site, and in 2008, work began to set up the charter of the national park.
Split into simpler sentences: In April 2007, the Administration Council took office; between 2007 and 2009, personnel were employed and installations made on the site. In 2008, work began to set up the charter of the national park.