Complex sentence: In 1961, the Cricket Association of Nepal (CAN) became part of the National Sports Council, to attempt to promote cricket in the whole of Nepal, though this tended to be limited to Kathmandu until the 1980s.
Split into simpler sentences: In 1961, in an effort to promote cricket to the whole of Nepal, the Cricket Association of Nepal became part of the National Sports Council. Nevertheless, the National games tended to be limited to Kathmandu until the 1980s.