Change it into an Adjective Clause: The man was sick. He looked very pale.
The man who/that looked very pale was sick,or The man, who looked very pale, was sick.
Change it into Adjective Clause: He was sitting in the emergency room. It was very crowded.
He was sitting in the emergency room which was very crowded
Change it into an Adjective Clause: A nurse was nearby. He called to her.
He called to a nurse who was nearby, or A nurse, whom he called to, was nearby.
