Complex sentence: India claims the entire state of Jammu and Kashmir and, administers approximately 43% of the region, including most of Jammu, the Kashmir Valley, Ladakh, and the Siachen Glacier.
Split into simpler sentences: India claims the entire state of Jammu and Kashmir, and,, administers approximately 43% of the region. They control Jammu, the Kashmir Valley, Ladakh, and the Siachen Glacier.