Complex sentence: In New Zealand and in South Africa it is sometimes called "varsity" (although this has become uncommon in New Zealand in recent years), which was also common usage in the UK in the 19th century.
Split into simpler sentences: In New Zealand and in South Africa it is sometimes called "varsity" (although this has become uncommon in New Zealand in recent years). "Varsity" was also common usage in the UK in the 19th century.