I can't find the words "combined yield" for the German translation on https://crowdin.com/project/factorio/de#. It is in the tooltip on the map for crude oil fields.
A fitting translation would be "kombinierter Ertrag" (for example: "Rohöl kombinierter Ertrag 3000%").
My first impression was pretty bad. The gameplay seemed to be very boring and I refunded the game on Steam after a few minutes of playtesting.
Then I saw some examples of what you can do in this game and a friend gifted me another copy of this game on Steam and I tried it again. I learned the ...