Complex sentence: In 1895, Congress closed Fort Mackinac and Mackinac National Park and gave the fort and park to the State of Michigan, which created Mackinac Island State Park, the first state park in Michigan.
Split into simpler sentences: In 1895, Congress closed Fort Mackinac and Mackinac National Park. It transferred the fort and park to the State of Michigan, which created Mackinac Island State Park, the first state park in Michigan.