Simplify the following text for a Grade 8 native English-speaking person.
Original: Like other land animals that have adapted to life in a marine environment , sea snakes ingest considerably more salt than their terrestrial relatives through their diet and when sea water is inadvertently swallowed .
Simplified: Like other land animals that have adapted to life in a marine environment , sea snakes swallow considerably more salt than their relatives living on land . They do this through their diet and when they inadvertently swallow sea water .