Complex sentence: Salsa20 performs 20 rounds of mixing on its input; however, reduced round variants Salsa20/8 and Salsa20/12 using 8 and 12 rounds respectively have also been introduced.
Split into simpler sentences: Salsa20 performs 20 rounds of mixing on its input. However, reduced round variants Salsa20/8 and Salsa20/12 using 8 and 12 rounds respectively have also been introduced.