Complex sentence: Once a male and a female are paired, the male goes on to complete the nest including the entrance tunnel, males are solely incharge of building the nests, though their female partners may join in giving the finishing touches.
Split into simpler sentences: Once a male and a female are paired, the male goes on to complete the nest including the entrance tunnel. Males are solely incharge of building the nests, though their female partners may join in giving the finishing touches.