Complex sentence: Since 1974, the bishops of the Indian Ocean islands would gather each year in an informal and in 1976 the Holy See recognized this assembly denominating Pastoral Zone of the South West Indian Ocean islands.
Split into simpler sentences: Since 1974, the bishops of the Indian Ocean islands would gather each year in an informal meeting. In 1976 the Holy See recognized this assembly with the name of Pastoral Zone of the South West Indian Ocean islands.