Simplify the following text for a Grade 7 native English-speaking person.
Original: The modern sport of American Handball is similar in context and rules to both Irish and Scottish versions played from the 13th century in Scotland and 14th century in Ireland . Both countries ' rules were standardized as Gaelic handball in the 18th century .
Simplified: The Gaelic handball sport was played since the 15th century in Ireland and Scotland .