Complex sentence: The digestive tract is similar to that of free-living nematodes only in the young larvae prior to their parasitic life; in the parasitic stages the oesophagus is disconnected from the mid-intestine, and females lack an anus.
Split into simpler sentences: The digestive tract is similar to that of free-living nematodes only in the young larvae prior to their parasitic life. The parasitic stages the oesophagus is disconnected from the mid-intestine and females lack an anus.