Complex sentence: Count Erik Jönsson Dahlbergh (10 October 1625--16 January 1703) was a Swedish engineer, soldier, and field marshal, originally of peasant stock, he eventually rose to the level of nobility through his military competence.
Split into simpler sentences: Count Erik Jönsson Dahlbergh (10 October 1625--16 January 1703) was a Swedish engineer, soldier, and field marshal. He was born of peasant stock but he eventually rose to the level of nobility through his military competence.