Complex sentence: The Drummonds continued to support the Jacobite cause in the uprisings of 1715 and 1745, although the family retained control of the estate until 1750 when they were attainted.
Split into simpler sentences: The Drummonds continued to support the Jacobite cause in the uprisings of 1715 and 1745. The family retained control of the estate until 1750 when they were attainted.