Filming on Sunday the 4th

I filmed parts of my film which involve my actor walking through the streets, however when we attempted to film the more complicated parts of the film we found it very difficult and therefore i am having to work out another way how to film these parts. Or a way in which to simplify The lip syncing so that it is easier for my actor to do as at the moment fitting the different parts of lip syncing together is extremely difficult due to the fact i am attempting to fit together lip syncing with jump cuts, which means that if i get the lip syncing wrong at all, i have to re film the entire peice.