Here's everything:
Poena= punishment, noun, a indicates its the subject
Nautarum= Sailors, arum means its genitive plural (genitive means possessive "of", so the word would translate to Sailors')
Erat= from the verb "to be," translates to they were or there was
Cura= noun, means care or concern, definetly a noun as well as the subject, probably of a clause
Reginae= Queen, ending could mean plural subject (but its not), genitive, or dative (indirect object- usually has "to" before it)

I thought I had it with "The sailors' punishment was the queen's care." But I'm not sure when you switch it from "they were" to "was" (occurs in third person with that verb), it still indicates Person.

Ah fuck it, that sounds good enough dammit.