Lydians and Persians
( ( Lydians and ) Persians )
(ROOT (NP (NNPS Lydians) (CC and) (NNPS Persians)))
Persians and Lydians did not exist.
( ( ( Persians and ) Lydians ) ( ( ( did not ) exist ) . ) )
(ROOT (S (NP (NNS Persians) (CC and) (NNS Lydians)) (VP (VBD did) (RB not) (VP (VB exist))) (. .)))