Complex sentence: On 9 September she left Greenock escorting "Duke of York" to Rosyth, and later that month, she was employed in patrolling the Iceland-Faroes passage to intercept enemy surface ships.
Split into simpler sentences: On 9 September she left Greenock escorting "Duke of York" to Rosyth. Later that month she was employed in patrolling the Iceland-Faroes passage to intercept enemy surface ships.