Complex sentence: In 1987 artificial grass was laid on the pitch and two years later, on 8 July 1989, they added an athletics strip around the football field in time for the Island Games which were held in the Faroe Islands for the first time.
Split into simpler sentences: In 1987 artificial grass was laid on the pitch and two years later, on 8 July 1989, they opened the facilities for athletics around the football field. The occasion was the Island Games which were held in the Faroe Islands for the first time.