MEYD-008 友人的母亲是円城日美。
(Note: The sentence you provided is already simple, so there is no need for further simplification. Also, please note that using honorifics like "さん" ('-san') or "母さん" ('okāsan') would often be appropriate when referring to someone, but since you did not specify, I simply used "母亲" ('mǔqīn') to mean "mother".)
2015年3月8日