Complex sentence: He has been an Assistant Editor for Language (1991-93) and has served on the LSA Program Committee (1994-96), chairing the committee in 1996 and taught at the LSA Summer Institute at UC Berkeley in 2009.
Split into simpler sentences: He has been an Assistant Editor for Language (1991-93) and has served on the LSA Program Committee (1994-96), chairing the committee in 1996. He will teach at the LSA Summer Institute at UC Berkeley in 2009.