Not sure if this is relevant or not. My little one not quite three also repeats parts of sentences over a few times before she is able to get the whole sentence out. I think there are two factors affecting her. I do think that her mind is far ahead of her sentence as there are times when she skips the mid part and just goes to the end. Since I am with her most of her day I am able to decipher what she is referring to. The other factor is that she has hypotonia and there is some huge amount of muscles in and around your mouth used for talking (something like 131). For her to coordinate it all takes extra time and effort and I think she buys that time by repeating herself and that also keeps her place in the talking.
I have been very careful not to call attention to the problem. When she finally gets out the sentence I repeat it back to her in a fluid manner and sometimes she will repeat it back to me in that same fluid manner. I think it helps her if I can stay really calm and just let her get it out at her own time and pace. (Patience is not easy for me!)
