Complex sentence: Skilled metalurgists John Turner and John Vinton were brought in to manage the fineries, as well as hundreds of unskilled laborers to cut wood for making charcoal, and quarrying the bog ore and flux.
Split into simpler sentences: Skilled metalurgists John Turner and John Vinton were brought in to manage the fineries. Unskilled laborers cut wood for making charcoal, and quarrying the bog ore and flux.