Complex sentence: Catherine Sinclair (17 April, 1800--6 August, 1864) Scottish writer born at Thurso Castle, Caithness, Scotland to Sir John Sinclair, 1st Baronet and Diana Macdonald.
Split into simpler sentences: Catherine Sinclair (17 April, 1800--6 August, 1864) was a Scottish writer. She was born at Thurso Castle, Caithness, Scotland to Sir John Sinclair, 1st Baronet and Diana Macdonald.