Complex sentence: Japanese Mahjong scoring rules are used for Mahjong, a game for four players common in Japan, which were organized in "Taishō" to "Showa" period as it became popular.
Split into simpler sentences: Japanese Mahjong scoring rules are used for Japanese Mahjong, a game for four players common in Japan. The rules were organized in "Taishō" to "Showa" period as the game became popular.