Simplify the following text for a Grade 5 native English-speaking person.
Original: The Toray Pan Pacific Open ( æ ã ã '' ã ` ã ã '' ã ` ã ã ã # ã ã ã '' ã ã ã ) is a WTA Tour affiliated professional tennis tournament for women , held every year since 1984 on in Tokyo , Japan .
Simplified: The Toray Pan Pacific Open ( æ ã ã '' ã ` ã ã '' ã ` ã ã ã # ã ã ã '' ã ã ã ) is a WTA Tour of tennis tournaments for women . It is held every year since 1984 in Tokyo , Japan .