Complex sentence: In 1554, the claimant who would have been the next earl but for the attainder was created Earl of Kildare being restored to the original Patent in 1569 (as 11th earl).
Split into simpler sentences: In 1554, the claimant who would have been the next earl but for the attainder was created Earl of Kildare. He was subsequently restored to the original Patent in 1569 (as 11th earl).