Complex sentence: Before the club was developed on the island, it consisted of fans and friends of Lisbon's Benfica and gave its nickname to the club "Benfiquinha" ("Little Benfica" in Portuguese).
Split into simpler sentences: Before the club was developed on the island, it consisted of fans and friends of Portuguese club Benfica. They nicknamed the club "Benfiquinha" (meaning "little Benfica" in Portuguese).