Thank you for your welcome.
The gist of the quote is as follows:
the Greeks often displayed great naivety in adopting an approach that while pragmatic was for that very reason inconsistent, and that their appeal to the pope in the West was a natural means to find an independent and external arbiter to obtain mediation, but it was done only to resolve a single particular difficulty, and when the situation changed they lost interest
If you can find out for me, I will be very grateful.