Simplify the following text for a Grade 13 native English-speaking person.
Original: Naginata went through the influence of westernization after the Meiji Restoration ( 1868-1912 ) , when the value of martial arts dropped , and survived till the Showa period ( 1912 â `` 1926 ) , when naginata became a part of the public school system .
Simplified: Due to the influence of Westernization after the Meiji Restoration the perceived value of martial arts , the naginata included , dropped severely .