Your sentence says: "Let’s have one platypus climbing into its burrow between the tree roots (above the water that is), while the other one swimming underwater."
Here's a corrected version: "Let’s have one platypus climbing into its burrow between the tree roots (above the water, that is), while the other one is swimming underwater."
Explanation:
- We add "is" before "swimming" to make the verb phrase complete and grammatically correct: "the other one is swimming underwater."
- Adding a comma before "that is" helps clarify the phrase inside the parentheses.
So, the corrected sentence is clear and correctly structured for describing two platypuses doing different things.