Complex sentence: Serpent Mounds is a former provincial park that was established in 1955, in 1995 the park was given to the Hiawatha First Nation, a historic Mississaugas people who continue to operate it.
Split into simpler sentences: Serpent Mounds is a former provincial park that was established in 1955. In 1995 the park was given to the Hiawatha First Nation, a historic Mississaugas people who continue to operate it.