Complex sentence: These trees were introduced by Nievergelt and Reingold in the 1970s as trees of bounded balance, or BB (α) trees; their more common name is due to Knuth.
Split into simpler sentences: These trees were introduced by Nievergelt and Reingold in the 1970s as trees of bounded balance, or BB (α) trees. Their more common name is due to Knuth.