Er war bereits deutschlandweit auf

Er war bereits deutschlandweit auf zahlreichen Ausstellungen vertreten; seine raumgreifenden Objekte sind zudem im öffentlichen Raum (z. B. in Halle) und in Skulpturengärten zu finden.

Results (English) 1:

He was already across Germany represented at numerous exhibitions; his space-consuming objects can be found in the public space (E.g. in Halle) and sculpture gardens.

Results (English) 2:

He was already represented at numerous exhibitions throughout Germany; its large-scale objects can also be found (eg. B. Hall) and in sculpture gardens in public spaces.

Results (English) 3:

He was already represented in several exhibitions in Germany; its expansive objects are also in the public space (e.g. in Hall) and in sculpture garden.