Complex sentence: Born the son of Robert Dundas, a Scottish merchant, and Margaret Dundas (née Watson), Dundas graduated from the Royal Military Academy, Woolwich as a lieutenant-fireworker in the Royal Artillery on 1 March 1755.
Split into simpler sentences: Born the son of Robert Dundas, a Scottish merchant, and Margaret Dundas (née Watson), Dundas was enrolled at the Royal Military Academy, Woolwich. He graduated as a lieutenant-fireworker in the Royal Artillery on 1 March 1755.