Simplify the following text for a Grade 6 native English-speaking person.
Original: In 1905 , construction was begun on both the Watab Pulp and Paper Company as well as on the Sartell Dam across the Mississippi near the `` third rapids '' .
Simplified: In 1905 , some people started to build the Watab Pulp and Paper Company . They also started to build the Sartell Dam across the Mississippi near the `` third rapids '' .