good_example.jsx

class List extends React.Component {
  render() {
    return (
      <ul>
        <ListItem />
      </ul>
    );
  }
}

class ListItem extends React.Component {
  render() {
    return (
      <React.Fragment>
        <li>Hello</li>
        <li>World</li>
      </React.Fragment>
    );
  }
}