Complex sentence: On 14 April, one Hurricane was still serviceable at Nikšić in Montenegro, this aircraft was then involved in a clash with Italian fighters on 14 or 15 April and was hit 37 times.
Split into simpler sentences: On 14 April, one Hurricane was still serviceable at Nikšić in Montenegro. This aircraft clashed with Italian fighters on 14 or 15 April and was hit 37 times.