Good one, though it would be nice to cite the exact episode. A little googling and I think this is from "Amy's Choice" (Episode 5.7)
Also, I'd try to avoid ellipses in a quote unless you are in fact leaving something out. I suspect here you just meant it to reflect the doctor's speech pattern, but it's a bit confusing.
The convention I was taught is that "This... and that" is quoting someone who pauses after 'This', while "This [...] and that" indicates that I elided something. This seems to me both useful and clear.
Another month has passed and here is a new rationality quotes thread. The usual rules are: