Complex sentence: It was created on 8 July 1646 for Sir Francis Hawley, 1st Baronet, a supporter of Charles I who had already created him first Baronet of Buckland in the County of Somerset, in the Baronetage of England in 1644.
Split into simpler sentences: It was created on 8 July 1646 for Sir Francis Hawley, 1st Baronet. He had already been created a Baronet, of Buckland in the County of Somerset, in the Baronetage of England in 1644.