Complex sentence: In 1930 the company sold around Maine's highest point Mount Katahdin for $25,000 to former Maine Governor Percival Proctor Baxter who in turn donated the land to the state for what became Baxter State Park.
Split into simpler sentences: In 1930 the company sold around Maine's highest point Mount Katahdin for $25,000 to former Maine Governor Percival Proctor Baxter. In turn Baxter donated the land to the state, for what became the present day Baxter State Park.