Complex sentence: On the night of 10 July 1991 over 5000 LTTE cadres surrounded the 600 strong army garrison located at Elephant Pass, was known as the gateway to the northern Jaffna Peninsula.
Split into simpler sentences: On the night of 10 July 1991 over 5000 LTTE fighters surrounded the 600 strong army garrison located at Elephant Pass. The base was known as the gateway to the northern Jaffna Peninsula.