Complex sentence: Although of only moderate elevation, the isolation of the Ossipee Mountains gives Shaw of prominence above the low ground separating it from the White Mountains, making it one of twelve mountains in New Hampshire with a prominence over.
Split into simpler sentences: Although of only moderate elevation, the isolation of the Ossipee Mountains gives Shaw of height above the low ground separating it from the White Mountains. That makes Shaw one of twelve mountains in New Hampshire with a prominence over.