To help the reader follow your logic, link your sentences and paragraphs with effective transitional expressions. Here are some transitional words to consider when you are writing:
To Show Addition:
moreover, further, furthermore, besides, and, and then, likewise, also, nor, too, again, in addition, equally important, next, first, second, third, in the first place, in the second place, finally, last.
To Compare or Contrast:
similarly, likewise, in like manner, but, yet, and yet, however, still, nevertheless, on the other hand, on the contrary, even so, notwithstanding, for all that, in contrast to this, at the same time, although this may be true, otherwise, nonetheless.
in conclusion, to sum up, in brief, on the whole, in sum, in short, as I have said, in other words, that is, to be sure, as has been noted, for example, for instance, in fact, indeed, to tell the truth, in any event.