Research process so far

I did my outline for the research paper and now i have a clearer idea as to how to organize my paper and the main points I'm going to talk about. However, I'm struggling to find a good thesis for my paper since i feel that this topic is a little bit complicated for some reason. I've been trying to write some ideas but i don't know how to consolidate them into a single sentence. This process has just become harder and harder. I also feel like i don't have enough information to support my main point of view about the two sects which is conflict over political power. I feel like the sources I find all say the same things in different words but i hope as I keep researching this process gets easier... I can only hope though.