At one time, most of Europe's <e1>ammonia</e1> was produced from the Hydro <e2>plant</e2> at Vemork, via the electrolysis route.
At one time, most
At one time, most of Europe's ammonia was produced from the Hydro plant at Vemork, via the electrolysis route.
<triplet> ammonia <subject> plant <object> Entity-Origin(e1,e2)