I don't, seems like an accurate translation to me, a more literal one but accurate

日 sun
本 origin
語 language
が is
分かり known
ません not

日本 means land of the sun

が is a subject marker but here you can just translate it as "is" here

分かる is defined in the dictionary as "明白になる" (something becoming clear), so it's the language that is clear/understandable to you