Complex sentence: They won the Kent Senior Cup again in 1962-63 but it wasn't until the end of the sixties though that they were promoted to the Southern League Premier Division in the 1969-70 season.
Split into simpler sentences: They won the Kent Senior Cup again in 1962-63. It wasn't until the end of the sixties though that they were promoted to the Southern League Premier Division in the 1969-70 season.