Das Museum wurde vier Jahre lang umgebaut.
I have these two possible translations, but I am not sure, which is correct:
- The museum was rebuilt four years ago.
- The museum has been rebuilt since four years ago (and is still being rebuilt).
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ger: Das Museum wurde vier Jahre lang umgebaut.
eng: It took four years to rebuild the museum.
You don't have any information when the museum was rebuild. You just know that work is finished, but you don't know if they finished yesterday or 350 years ago.
eng: The museum was rebuilt four years ago.
ger: Das Museum wurde vor vier Jahren umgebaut.
Here you don't have any information how long it took to rebuild the museum. But you can guess that it took less than one year. Because if it did last longer, you would say something like.
eng: The museum was rebuilt between 2005 and 2009.
ger: Das Museum wurde zwischen 2005 und 2009 umgebaut.
eng: The museums rebuild was finished four years ago.
ger: Der Umbau des Museums wurde vor vier Jahren beendet.
eng: The museum has been rebuilt since four years ago (and is still being rebuilt).
ger: Das Museum wird seit vier Jahren umgebaut (und sie arbeiten noch immer daran).
Here you just know when they started and you know that they still work. But you don't know how long it will take and when they will be finished.
Note, that in German you use present tense (because they work now).