Complex sentence: On March 20,2009, Dave Holloway transported a search dog to Aruba to search a small reservoir in northern Aruba, previously identified by a supposed witness as a possible location of Natalee's remains.
Split into simpler sentences: On March 20,2009, Dave Holloway transported a search dog to Aruba to search a small reservoir in the northern part of the island. The reservoir was previously identified by a supposed witness as a possible location of Natalee's remains.