Complex sentence: The Valsalva maneuver should be the first vagal maneuver tried and works by increasing intra-thoracic pressure and affecting baro-receptors (pressure sensors) within the arch of the aorta.
Split into simpler sentences: The Valsalva maneuver should be the first vagal maneuver tried. It works by increasing intra-thoracic pressure and affecting baro-receptors (pressure sensors) within the arch of the aorta.