react.dev/cookbook/cb-05-jsx-root-node-count.md

id	title	layout	permalink
jsx-root-node-count	Maximum number of JSX root nodes	docs	jsx-root-node-count.html

Problem

You're getting a parsing error from JSX.

Solution

You might have tried to return more than one node from JSX in render. Currently, you can only return one node; meaning that you must wrap your components within, say, a div or a span (or any other component).

Discussion

Don't forget that JSX compiles into regular js, and returning two functions doesn't really make syntactic sense.