Complex sentence: A study done by Helen Newing in 2001 found that a correlation exists between body size and sleep patterns in duikers; while smaller to medium sized duikers show increased activity and scavenge for food during the daytime, larger duikers are most active at night.
Split into simpler sentences: A study done by Helen Newing in 2001 found that a correlation exists between body size and sleep pattern in duikers. Thus, smaller to medium sized duikers show increased activity and scavenge for food during the daytime, in contrast, larger duikers are most active at night.