Complex sentence: Methodical organisation and sustained efforts to promote the game in Bengal, made the IFA the premier football body in the country in the early decades of the 20th century AIFF controlling body largely because the IFA was affiliated to the Football Association of England.
Split into simpler sentences: Methodical organisation and sustained efforts to promote the game in Bengal, made the IFA the premier football body in the country in the early decades of the 20th century. For all practical purposes it was the national controlling body largely because the IFA was affiliated to the Football Association of England.