Original: During this time, the Canadians saw little fighting, with fewer than 100 troops proceeding "up country" to Omsk, to serve as administrative staff for 1,500 British troops aiding the White Russian government of Admiral Alexander Kolchak.
Simplified: Fewer than 100 troops left the base area to go to Omsk. Those 100 worked as administrative staff for 1,500 British troops who were helping the White Russian government of Admiral Alexander Kolchak.