Original sentence: Another glacier, the Maclure Glacier on nearby Mount Maclure, has also retreated significantly as well.It lies on the slopes of Mt.Lyell Glacier is a small, shrinking glacier in California's Sierra Nevada's Yosemite National Park.The glacier has retreated rapidly since the end of the Little Ice Age in the mid 1800s and sometime during the mid 20th Century, the glacier was split into two smaller glaciers occupying the high cirques of Mt.The glacier was discovered by John Muir and is the largest in Yosemite
Edited sentence: Another glacier, the Maclure Glacier on nearby Mount Maclure, has also retreated significantly.During the mid 20th Century, the glacier split into two smaller glaciers occupying the high cirques of Mount Lyell.Lyell Glacier is a small glacier in the Sierra Nevada of California.The glacier has retreated since the end of the Little Ice Age in the mid 1800s.The glacier lies on the northern slopes of Mount Lyell.The glacier was discovered by John Muir in 1871 , and is the largest glacier in Yosemite National Park