Complex sentence: Seydlitz was born on 3 February 1721, in Kalkar in the Duchy of Cleves, where his father, Daniel Florian Seydlitz, was a major of Prussian cavalry with the Cuirassier Regiment Markgraf Friedrich Wilhelm of Brandenburg-Schwedt No.5.
Split into simpler sentences: Seydlitz was born on 3 February 1721, in Kalkar in the Duchy of Cleves, where his father was stationed. His father, Daniel Florian Seydlitz, was a major of Prussian cavalry with the Cuirassier Regiment Markgraf Friedrich Wilhelm of Brandenburg-Schwedt No.5.