Can someone answer this question please answer it correctly if it’s corect I will mark you brainliest

Answer:
Add a semicolon there.
Explanation:
The semicolon divides two separate thoughts.
Answer:
Louis - Jacques- Mandé Daguerre and Nicéphore Niépce invented the first successful photographs in the 1830s. Niépce initial effort required eight hours is exposure time ; Daguerre's required only twenty or thirty minutes.