Complex sentence: In 1983, the board became a member of the World Trade Centers Association and in 1986 moved into the ocean-front World Trade Centre office complex, hosting the General Assembly of the World Trade Centers Association the same year.
Split into simpler sentences: In 1983, The Board became a member of the World Trade Centers Association. And in 1986 The Board moved into the ocean-front World Trade Centre office complex, hosting the General Assembly of the World Trade Centers Association the same year.