Complex sentence: He is one of only two grandsons of renowned physicist Albert Einstein for among Einstein's three children, Lieserl Einstein (assumed to have died in infancy), Hans Albert Einstein, and Eduard Einstein, only Hans married.
Split into simpler sentences: He is one of only two grandsons of renowned physicist Albert Einstein. Among Einstein's three children, Lieserl Einstein (assumed to have died in infancy), Hans Albert Einstein, and Eduard Einstein, only Hans married.