Some examples of commas offsetting non-essential elements would be the following:
Non-Essential: Maya Angelou, a renowned American poet, was born in St. Louis, Missouri in 1928.
Essential: Renowned American poet Maya Angelou was born in St. Louis, Missouri in 1928.
Non-Essential: Led Zeppelin, an English rock band, is best known for their song “Stairway to Heaven.”
Essential:English rock band Led Zeppelin is best known for their song “Stairway to Heaven.”
Non-Essential: Chicken and waffles, a favorite American soul food dish, is a popular cuisine in Baltimore, Maryland.
Essential:The favorite American soul food dish chicken and waffles is a popular cuisine in Baltimore, Maryland.