skjoex,
that comma doesn't belong there, I think it is a syntax error. Ctrl-Enter is the way to make a continuation on the next line. It's not documented, but left over from an older version of mathcad. I don't know a way to make the continued line start where your asterisk is though. You can try invoking the ctrl-enter before the first plus to get it closer to the location of your asterisk.
regards,
chichuck