Complex sentence: There was also an acute shortage of common and skilled labor: the contractor had only three-quarters of the required workforce, and less after high turnover and absenteeism, mainly the result of poor accommodations and difficulties in commuting.
Split into simpler sentences: There was also an acute shortage of common and skilled labor, and the contractor had only three-quarters of the required workforce. This was aggravated by high turnover and absenteeism, mainly the result of poor accommodation and consequent difficulties in commuting.