Complex sentence: The award was unanimous, but gave no reasons for the decision, merely describing the resulting boundary, which gave Britain almost 90% of the disputed territory Schoenrich (1949:526) and all of the gold mines.
Split into simpler sentences: The award was unanimous, but gave no reasons for the decision, merely describing the resulting boundary, which gave Britain almost 90% of the disputed territory. However, Britain received most of the disputed territory, and all of the gold mines.