Complex sentence: In April 1789, a catastrophic epidemic disease now thought to be chickenpox spread through the Eora people and surrounding groups, with the result that local Aborigines died in their thousands, and bodies could often be seen bobbing in the water in Sydney Harbour.
Split into simpler sentences: In April 1789, a catastrophic epidemic disease, now thought to be chickenpox, spread through the Eora people and surrounding groups, with the result that local Aborigines died by the thousands. Their bodies could often be seen bobbing in the water in Sydney Harbour.