Translations
They arrived at Marah but could not drink the water there — for it was bitter. And so the place was called Marah.
They came to Marah, but could not drink the water of Marah, for it was bitter. That is why it was named Marah.
And when they came to Marah, they could not drink of the waters of Marah, for they were bitter: therefore the name of it was called Marah.
And when they came to Marah, they could not drink the water there because it was bitter. (That is why it was named Marah.)