Complex sentence: The etymology of the name Threadneedle Street is most likely from the Anglo-Saxon old English Threadn meaning to prosper some say that it originated as Three Needle Street (first attested in 1598) from a signboard portraying three needles.
Split into simpler sentences: The etymology of the name Threadneedle Street is most likely from the Anglo-Saxon old English Threadn meaning to prosper. Some say that it originated as Three Needle Street (first attested in 1598) from a signboard portraying three needles.