I think what you mean is compound words vs other words?
Wikipedia says there are lots of compound words in English.
Plaintiff is borrowed from Old French. Litigation from Latin…
I suppose it boils down to when and under what circumstances a term was needed to describe something. Sometimes there was a word from another language available. Or the whole subject came from a different culture. And sometimes they just described it with a compound of what it resembles. And how to make up terms probably also depends on what is en vogue at the time.
GDPR for Dummies. GDPR is DSGVO in German, “Datenschutz-Grundverordnung”.