Then the liquid in the flask was boiled strongly, so that all of the air which was in the flask and tubes was either driven out or heated to the boiling point of water.
(the liquid in the flask; was boiled strongly; T:Then) (the air; was; in the flask and tubes) (all of the air; was; either driven out or heated to the boiling point of water)
the liquid in the flask the air all of the air
was boiled strongly was was
T:Then
in the flask and tubes
either driven out or heated to the boiling point of water