Question

My sister Gina bought a 1957 Chevy at the car auction that was old and rusty.

Answer 1

Answer:

this is one example: My sister Gina bought a 1957 Chevy at the car auction; it was old and rusty.

Explanation:

Answer 2

My sister Gina bought a 1957 Chevy at the car auction. It was old and rusty.
or
My sister Gina bought a 1957 Chevy at the car auction; it was old and rusty.
or
My sister Gina bought a 1957 Chevy at the car auction, and it was old and rusty.
Good luck!