Complex sentence: For a length of 61 kilometers (nearly 40 miles) it makes a completely straight line between the summits of Våndsjögusten (1002 meter) and Østerhogna (1185 meter), straight-line national borders being very unusual in Scandinavia except in the very northernmost parts.
Split into simpler sentences: For a length of, it makes a completely straight line between the summits of the tall mountain Våndsjögusten and the tall mountain Østerhogna. Straight-line national borders are very unusual in Scandinavia, except in the very northernmost parts.