Complex sentence: The name "mor-hen" has been recorded in English since the 13th century, and the word "moor" here is an old sense meaning "marsh"--the species is not usually found in moorland.
Split into simpler sentences: The name "mor-hen" has been recorded in English since the 13th century,. The word "moor" here is an old sense meaning "marsh"--the species is not usually found in moorland.