Complex sentence: For the 25 years up to 1992, IGGI was a key regional insitution in Southeast Asia because it helped provide strong international support for Indonesia's economic recovery after the economic difficulties in Indonesia during the period of the Sukarno presidency in 1950s and 1960s.
Split into simpler sentences: For the 25 years up to 1992, IGGI was a key regional insitution in Southeast Asia. It helped provide strong international support for Indonesia's economic recovery after the economic difficulties in Indonesia during the period of the Sukarno presidency in 1950s and 1960s.