Can it be said that Priestly's experiment helped us to find out more about composition of air ? How ?

Explanation

Yes, Priestly's experiments helped to find out the composition of air when burning of charcoal, carbondioxide is produced which is the one of the composition of air done by Lavoisier. Another experiment with phosphorus done by -Lavoisier was cleared that a gas which is the respirable air that is helped in burning was oxygen also a component of air.
Lavoisier proved experimentally that carbondioxide and oxygen were the components of air. Lavoisier confirmed the experiments of Priestly about the gases present in the air.