Join the sentences into one simple sentence: Do or die. Live and let live.

There are many ways combining these sentences can be
accomplished.  In my mind, the most direct way would have to rely on the concept of the
compound sentence.  The compound sentence combines two or more independent clauses into
one with the use of some type of punctuation.  Given how both sentences featured in the
example are imperative sentences, this can be played with in a variety of ways.  For
example:

"Do
or die, or live and let live."

"Do or die, and live and let
live."

This is how I see that
you are able to combine both of the sentences into one direct sentence.  However, as you
can tell, the challenge here is that both of the clauses' meanings are opposite of one
another.  To "do or die" means compliance or death, while the idea of tolerance and
permissiveness is a part of "live and let live."  This makes both of them contradictory
to one another, so if you combine them in one sentence.  It will seem a bit awkward in
terms of meaning. so you might need to add some more words in order to bring out their
divergent meaning in one sentence:

readability="6">

"Do or die" was one choice, and "live and let
live" was another.

Adding
some words to bridge the opposing meaning of each sentence, I was able to add a comma
and the conjunction "and" to make a compound sentence.