Complex sentence: This is a defunct men's tennis tournament that was held annually under various names and was part of the Grand Prix tennis circuit tour from (1970-1989) it then became an ATP Tour event until 1995.
Split into simpler sentences: This is a defunct men's tennis tournament that was held annually under various names from 1979 through 1995. Part of the Grand Prix tennis circuit tour from (1970-1989) it then became an ATP Tour event until 1995.