Which sentence is punctuated properly?
I have been to the conference before, I am excited to go again.
I have been to the conference before, and I am excited to go again.
I have been to the conference before; and I am excited to go again.
Despite having been before I am excited to attend the conference.
The sentence that is punctuated properly is:
I have been to the conference before, and I am excited to go again.