Complex sentence: Each year an additional cohort of doctors new to clinical practice (e.g. new graduates and doctors from overseas) is invited, maintaining maintains the numbers responding to around 10,000, though this is falling slightly each year.
Split into simpler sentences: Each year an additional cohort of doctors new to clinical practice (e.g. new graduates and doctors from overseas) is invited. This maintains the numbers each responding to around 10,000, though this is falling slightly each year.