Complex sentence: Nose is not not used for air flow and the turbinates become swollen due to loss of vasomotor control lateer having additional factor of infection due to stagnation of discharge in the nasal cavity which should otherwise drain freely into nasopharynx.
Split into simpler sentences: Nose is not used for air flow and the turbinates become swollen due to loss of vasomotor control. In choanal atresia their is an additional factor of infection due to stagnation of discharge in the nasal cavity which should otherwise drain freely into nasopharynx.