Complex sentence: This dominance was finally broken in 1967 by Estudiantes de La Plata; since then, ten other teams have won the championship, resulting in a total of 27 teams having been champions of Argentina as of 2016.
Split into simpler sentences: This dominance was finally broken in 1967 by Estudiantes de La Plata. Since then, ten other teams have won the championship, resulting in a total of 27 teams having been champions of Argentina as of 2016.