Complex sentence: The 1st and 2nd eleven teams play in the Sussex Cricket League in division 3, whilst the 3rd and 4th elevens play in division 11 and 12 of the East Sussex Cricket League.
Split into simpler sentences: The 1st and 2nd eleven teams play in the Sussex Cricket League in division 3. Whilst the 3rd and 4th elevens play in division 11 and 12 of the East Sussex Cricket League.