Complex sentence: The East Caribbean dollar is pegged to the United States dollar, and has been for over 35 years since 1976 having previously been pegged to the pound sterling.
Split into simpler sentences: The East Caribbean dollar is pegged to the United States dollar, and has been for over 35 years, since 1976. Before the East Caribbean dollar was pegged to the United States dollar, it was pegged to the Pound sterling.