Should this be two sentences or one? I know second is a transition, but not sure it is a conjunction...

First he asked to who I was e-mailing second he wanted to know who had ridden a motorcycle down the alley.

7 answers

Yes, it should be two sentences.

Also -- the first sentence should be correct to -- "First, he asked to WHOM I was e-mailing.
You could also separate the two sentences with a semicolon.
So Ms. Sue would Second be an interjection to be followed by a comma?
Second is not an interjection, but it should be followed by a comma.
Thank you!
You're welcome.
You could aso do

First he asked to whom I was emailing. Second, he wanted to know who had ridden a motorcycle down the alley.