What is this in Latin??

From About.com:

So, the phrase "When there was only one set of footprints, it was then that I carried you" can be translated into Latin as follows:

"Cum una tantum erat vestigiorum series, tunc vero Ego ipse te ducebam."

Please note that :
When =CUM
there was =ERAT
only =TANTUM
one = UNA
set =SERIES
of footprints=VESTIGIORUM
it was=ERAT
then =TUNC VERO
that I =EGO IPSE
carried =DUCEBAM
you =TE

All the best
Maria