[rolandog]

The "standard" method would be to double space after the end of a sentence. This is how "filling" paragraphs works in org-mode to avoid breaking a line in the middle of an abbreviation.

[WillAdams]

No, that's a convention from typing.

The actual approach used by a printer would be to be more generous with spacing material at the end of a sentence.

The relevant TeX commands are \frenchspacing or \nofrenchspacing.