YOU SAID:
Today is a day of sundays that is a day for ads
INTO JAPANESE
今日は広告の日である日曜日です
BACK INTO ENGLISH
Today is Sunday, the day of advertising
INTO JAPANESE
今日は日曜日、広告の日です
BACK INTO ENGLISH
Today is Sunday, advertising day
INTO JAPANESE
今日は日曜日、広告の日です
BACK INTO ENGLISH
Today is Sunday, advertising day
That didn't even make that much sense in English.