Use a comma and a coordinating conjunction to combine the sentence pairs into one sentence.
-Before the invention of e-mail, people communicated by regular mail. They often had to wait days for a reply to a simple letter.

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The Answer is Before the invention of e-mail, people communicated by regular mail, and they often had to wait days for a reply to a simple letter.

Use a Comma and a Coordinating Conjunction to Combine the Sentence