Complex sentence: This was the beginning of many vessels added to the fleet of the C S Boone Dredging, some of them built at the Collingwood Drydock Co. for C S Boone Dredging and Construction Company over a 40 year period.
Split into simpler sentences: This was the beginning of many vessels added to the fleet of the C S Boone Dredging. Some of the vessels were built at the Collingwood Drydock Co. for C S Boone Dredging and Construction Company over a 40 year period.