Complex sentence: Australia assisted the Indonesian military with training and materiel, even while human rights abuses were occurring and the Indonesian military was implicated in massacres, though the independence movement was supported by some within Australia as well.
Split into simpler sentences: Australia assisted the Indonesian military with training and materiel, even while human rights abuses were occurring and the Indonesian military was implicated in massacres. At the same time, the independence movement was supported by some within Australia as well.