Complex sentence: The success of Yale's bone marrow drives is statistically unlikely, according to Sam Rubin who works in Yale's sports publicity department, Usually, it takes tens of thousands of people to get one match.
Split into simpler sentences: The success of Yale's bone marrow drives is statistically unlikely, according to Sam Rubin who works in Yale's sports publicity department. Rubin stated, Usually, it takes tens of thousands of people to get one match.