Original sentence: From Waddington's 13,000'-plus fang to sea level at the heads of Bute and Knight Inlets is only a few miles; across the 10,000 foot deep gorges of the Homathko and the Klinaklini Rivers stand mountains almost as high, and icefields even vaster and whiter, only a few aerial miles away, with a maw deeper than the Grand Canyon, comparable in relief to the Himalayas (to which the terrain of British Columbia was compared by colonial-era travellers)
Edited sentence: From Waddington's 13,186' fang to sea level at the heads of Bute and Knight Inlets is only a few miles; across the 10,000 foot deep gorges of the Homathko and the Klinaklini Rivers stand mountains almost as high, and icefields even vaster and whiter, only a few aerial miles away, with a maw deeper than the Grand Canyon, comparable in relief to the Himalayas (to which the terrain of British Columbia was compared by colonial-era travellers)