Complex sentence: This proved difficult because the contamination was mainly heavy fuel oil (n ° 6) and therefore, extremely viscous, especially in cold, cloudy weather, which limited the use of tractor drawn vacuum trucks in cleaning up the beaches.
Split into simpler sentences: This proved difficult because the contamination was mainly heavy fuel oil (n ° 6) and therefore, extremely viscous, especially in cold, cloudy weather. This limited the use of tractor drawn vacuum trucks in cleaning up the beaches.