Complex sentence: Upon inmigrating to the U.S. in 1946, he accepted a pulpit in Brooklyn, NY, and six years later he was offered the rabbinate of Mexico, holding this position until his death.
Split into simpler sentences: Upon inmigrating to the U.S. in 1946, he accepted a pulpit in Brooklyn, NY. Six years later he was offered the rabbinate of Mexico and held this position until his death.