Complex sentence: Australian development aid to Indonesia traces back to 1953 with Indonesia's participation in the Colombo Plan, in addition to projects such as the Aeronautical Fixed Telecommunication Network, a project intended to address deficiencies in Indonesia's civil aviation system.
Split into simpler sentences: Australian development aid to Indonesia traces back to 1953 with Indonesia's participation in the Colombo Plan. Numerous projects were established such as the Aeronautical Fixed Telecommunication Network, a project intended to address deficiencies in Indonesia's civil aviation system.