Your passage does read well and also "sounds good."
The only thing that I might suggest is a little variety in your use of the adverb, however: Generally speaking, when one uses the word however to mean either (a) in whatever manner or way, or (b) In what way. Used as an intensive of how, the word works easily at the beginning of a sentence. (Please see the sentence models given in the previous link.)
Please note that in your passage, the word however never has this meaning. In these cases, where it means nevertheless, the word works best when "tucked in between" a sentence (usually separating two clauses). For example:
Edison used to spend the whole day, however, working on his experiments.By doing this, you subjugate the word to a lesser position where it does not detract from the main ideas of your sentence but rather serves to facilitate its overall fluency, while at the same time serving (here) to conjoin the two clauses.
(Please note the USAGE NOTE given for the previous link I've provided above. As you'll find from reading this brief note, there is no "hard and fast" "rule" against using however at the beginning of a sentence; consider it simply instead, a means for facilitating your expression.)
Above, I've just provided you with a model for making these changes throughout your text. Why don't you go ahead and try this out? I think that you'll find these edits effective for the reasons already given.
Finally, for the sake of variety, you might also consider using a synonym for the word however, i.e., nonetheless or nevertheless, every now and then. If you "pepper" these alternatives strategically throughout your writing (specifically, in your posted text, as well as, generally speaking, in all your writing), you'll relieve a certain degree of otherwise monotonous construction.
- For Teachers