Original sentence: Through his friend Edward Ellerker Williams, he was introduced to Percy Bysshe Shelley and later to Lord Byron, to become part of their Pisan Circle of friends
Edited sentence: Through his friend Edward Ellerker Williams, he was introduced to Percy Bysshe Shelley and later to Lord Byron, to become part of their Pisan Circle of friends that also included Shelley and Byron biographer Thomas Medwin and Leigh Hunt