Complex sentence: In the early decades (up to the 1930s), the Derry GAA competitions took in a number of clubs from Donegal and Tyrone, while at various times clubs in South Derry played in the Antrim or Tyrone leagues.
Split into simpler sentences: In the early decades (up to the 1930s), the Derry GAA competitions took in a number of clubs from County Donegal and Tyrone. At various times clubs in South Derry played in the Antrim GAA or Tyrone leagues.