Complex sentence: Students usually complete their biomedical coursework in the first year but usually spend as much time as doctors-up to three years-in clinical training studying diseases, their causes, diagnosis, treatment and prevention and undergoing supervised clinical practice.
Split into simpler sentences: Students usually complete their biomedical coursework in the first year. However, they spend as much time as doctors-up to three years-in clinical training where they study diseases, their causes, diagnosis, treatment and prevention and undergo supervised clinical practice.