Complex sentence: Flowing from the glacier, the river intersects the Iditarod National Historic Trail, which follows the Eagle River Valley from near Crow Pass in Chugach National Forest to the community of Eagle River, which is part of the municipality.
Split into simpler sentences: Flowing from the glacier, the river intersects the Iditarod National Historic Trail, which follows the Eagle River Valley from near Crow Pass in Chugach National Forest to the community of Eagle River. After leaving the park, the river flows by the community of Eagle River, which is part of the municipality.