Complex sentence: James Douglas was born in 1803 in Demerara (later part of Guyana) to John Douglas, a Scottish Planter and Merchant from Glasgow, who was in business with three of his brothers.
Split into simpler sentences: James Douglas was born in 1803 in Demerara (later part of Guyana). His father was John Douglas, a Scottish Planter and Merchant from Glasgow in business with three of his brothers.