[amayne]

GPT-3 Davinci from 2020 could do this too:

Segment this text into proper sentences:

Input:

UNDERNEATHTHEGAZEOFORIONSBELTWHERETHESEAOFTRANQUILITYMEETSTHEEDGEOFTWILIGHTLIESAHIDDENTROVEOFWISDOMFORGOTTENBYMANYCOVETEDBYTHOSEINTHEKNOWITHOLDSTHEKEYSTOUNTOLDPOWER

Output:

1. Underneath the gaze of Orion's belt, where the sea of tranquility meets the edge of twilight, lies a hidden trove of wisdom forgotten by many, coveted by those in the know. 2. It holds the keys to untold power.