Question

Which is not a run-on sentence? The Southern Cross was important to the aboriginal people, they believed the pattern of the stars was of a wedge-tailed eagle. The Southern Cross was important the aboriginal people they believed the pattern of the stars was of a wedge-tailed eagle. The Southern Cross was important to the aboriginal people, who believed the pattern of the stars was of a wedge-tailed eagle. The Southern Cross was a wedge-tailed eagle pattern, the aboriginal people, they believed the stars were important.

Answer 1

The second sentence you put because it is not complete by any commas. The sentence does not flow thoroughly together.

Answer 2

Answer

The Southern Cross was important to the aboriginal people, who believed the pattern of the stars was of a wedge-tailed eagle.
Explanation
It does not go on and on forever