Complex sentence: Macauley led American Arithmometer, which would become Burroughs Adding Machine Company for five more years in Detroit until 1910 when he was hired as general manager of Packard by Henry Bourne Joy.
Split into simpler sentences: Macauley led American Arithmometer--which would become Burroughs Adding Machine Company--for five more years in Detroit. In 1910 he was hired as general manager of Packard by Henry Bourne Joy.