Complex sentence: The press and public hail Sullenburger a hero, but the incident leaves him deeply traumatized, and Sullenberger is diagnosed with PTSD shortly afterwards, and he repeatedly imagines the plane crashing into a building.
Split into simpler sentences: The press and public hail Sullenburger a hero, but the incident leaves him deeply traumatized, and suffering from symptoms of PTSD. He repeatedly imagines the plane crashing into a building.