pokh Louis Agassiz in 1837 to propose the concept of an age in which great ice sheets existed in what are now temperate areas. Please clarify There was an age in which (or during which) something happened. That "something" was the existence of great sheets of ice in what are now temperate areas.
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pokhLouis Agassiz in 1837 to propose the concept of an age in which great ice sheets existed in what are now temperate areas. Dont we need to have comma ..There seems to be two prepositional phrase in series..Please clarifyThere was an age in which (or during which) something happened.