I've been researching the internet, trying to better understand the use of conjunctions as the start of a sentence. In some cases it works wonderfully, and in others it shouldn't be used at all. Below is my example of the problem I'm running into... I had seen a lot of auras over the last six years, even more now that I had moved to the city, but I had never seen an aura that glowed as brightly as Rachel's. But then I remembered remembered the aura I saw last night in the alley and how it glowed with twinkling lights instead of a solid source. Now, the question I have is the But then at the start of the second sentence. The point was to separate the two thoughts, hence the period, and express a difference by using But. I suppose the then was meant to help separate the thoughts by time as well. I guess the question I have is, in what ways could I improve this?