Complex sentence: In March 2005, the oldest tree in the park was killed because it was in the way of the construction of the toddler playground, which is planned to be finished by the end of April, 2005.
Split into simpler sentences: In March 2005, the oldest tree in the park was killed because it was in the way of the construction of the toddler playground. The toddler playground is planned to be finished by the end of April, 2005.