Alexander the Great

If I have to convey the essence of Alexander the Great in a single word, I will chosse self-importance. And because of this consequentialitypersonal attribute 1 , he set up the Macedonia Empire, and yet for the same reason, he left nothing of his empire behind 2 but merdered by others. Admittedly, he was a great military commandor commander. Under his leadership, Macedonia defeated the mighty Persian Empire.heavily and made a great success3.

1.  You can also say, "And because of this consequence".  This is one of the rare situations that I do not mind starting a sentence using "and".  However, I rather rewrite the sentence as, "The result of this...."

2.  This is historically "incorrect" because all standard versions said that he fell ill after his campaign in India and died in Persia.  If you believed that he was murdered, poisoned or whatever it is, you must substantiate your claim against the current view of things.  If you don't, then you will have to follow the conventional wisdom.

3.  This is redundant.  What more success is there when you are victorious.