Lydians and Persians
( ( Lydians and ) Persians )
(ROOT (NP (NNPS Lydians) (CC and) (NNPS Persians)))
Lydians and Persians were friendly nations.
( ( ( Lydians and ) Persians ) ( ( were ( friendly nations ) ) . ) )
(ROOT (S (NP (NNS Lydians) (CC and) (NNS Persians)) (VP (VBD were) (NP (JJ friendly) (NNS nations))) (. .)))