Complex sentence: Fürer's algorithm is an integer multiplication algorithm for quite large integers possessing a very low asymptotic complexity which can be also optimized by using the inverse Ackermann function instead of the iterated logarithm.
Split into simpler sentences: Fürer's algorithm is an integer multiplication algorithm for quite large integers. It has a very low asymptotic complexity which can be further optimized by using the inverse Ackermann function instead of the iterated logarithm.