Complex sentence: The Nokia brand returned to the smartphone market through HMD Global with four new phones announced at Mobile World Congress; a refreshed Nokia 3310 and the Android smartphones Nokia 6, Nokia 5 and Nokia 3.
Split into simpler sentences: The Nokia brand returned to the smartphone market through HMD Global with four new phones announced on Mobile World Congres. New Nokia 3310, Nokia 6, Nokia 5 and Nokia 3.