Complex sentence: The rule is often mistakenly believed to prohibit "foreign sports" at GAA owned stadiums however a number of non Gaelic games such as Boxing and American football took place in Croke Park before Rule 42 was modified.
Split into simpler sentences: The rule is often mistakenly believed to prohibit "foreign sports" at GAA owned stadiums. However, non-Gaelic games such as Boxing and American football did take place in Croke Park before Rule 42 was modified.