Complex sentence: She is the first non-Harvard associate to be employed at Pearson Specter Litt, despite receiving a Harvard-worthy score on the LSAT, the next year's Harvard class was already full with candidates who scored higher, so Rachel decides to join Columbia.
Split into simpler sentences: She is the first non-Harvard associate to be employed at Pearson-Specter-Litt. Although she finally received a Harvard-worthy score on the LSAT, the next Harvard class was already full with candidates who scored higher, and decides to join Columbia.