Complex sentence: Johann Reinhold Patkul (1660-1707), a Livonian politician and agitator of Baltic German extraction, was born in prison at Stockholm, where his father lay under suspicion of treason.
Split into simpler sentences: Johann Reinhold Patkul (1660-1707) was a Livonian politician and agitator of Baltic German extraction. He was born in prison at Stockholm, where his father lay under suspicion of treason.