en_obs-tn/content/03/09.md

the rains stopped

This could be translated as: “it stopped raining.”

the boat rested

There was so much water from the rain that it covered the mountains. The ship floated over the mountains, and when the water started to go down, the ship went down with the water and settled on a mountain.

After three more months

During the next three months, the water continued to go down.

were visible

Other ways to translate this would be “were showing” or “appeared” or “could be seen.” It may be more clear to say: “After three months, the water had gone down enough so that Noah and his family could clearly see the tops of the mountains.”