举例子：
每年的八月15是中秋节,始于1208年（随便写的）.
1.Mid-Autumn Festival is held on the 15th day of the eighth month in the Chinese calendar from 1208.
用插入语会更好：
2.Mid-Autumn Festival,originally began from 1208,is held on the 15th day of the eigth month in the Chinese calender.
楼主可以随便套一个:)