Complex sentence: Imagism was a movement in early 20th-century Anglo-American poetry that favored precision of imagery and clear, sharp language; it was described as the most influential movement in English poetry since the activity of the Pre-Raphaelites.
Split into simpler sentences: Imagism was a movement in early 20th-century Anglo-American poetry that favored precision of imagery and clear, sharp language. It has been described as the most influential movement in English poetry since the activity of the Pre-Raphaelites.