Complex sentence: Samples may be collected by shaking, brushing, taping, vacuuming, swabbing and hand picking, although great care may be needed to prevent contamination with other substances (such as natural oil and sweat on the hand of the collector).
Split into simpler sentences: Samples may be collected by shaking, brushing, taping, vacuuming, swabbing and hand picking. Great care may be needed to prevent contamination with other substances (such as natural oil and sweat on the hand of the collector).