Elements of Style - Enclose parenthetic expressions between commas

Some Examples.

 

Enclose parenthetic expressions between commas.

Marjorie's husband, Colonel Nelson paid us a visit yesterday,

 

The audience, which had at first been indifferent, became more and more interested.

In 1769, when Napoleon was born, Corsica had but recently been acquired by France.

Nether Stowey, where Coleridge wrote The Rime of the Ancient Mariner, is a few miles from Bridgewater.