Can someone clarify DNA's semi-conservative replication

I know there is one old and one new strand.

But is the old one the SAME one or is the old one replicated again?

I'm very confused. Please help.

Thanks. Easy 10 points!

DNA is a double helix. When replication occurs, each strand splits apart, and RNA polymerase and DNA polymerase begin to form new strands of DNA which are complimentary to the old strands which are serving as a template. So when replication is over, there is one old strand and one new strand in each of the two DNA molecules which are produced. Hope this helps