Complex sentence: Lavarnway was called up to the majors in August and appeared in 46 games for the Red Sox, and is currently serving as the back-up catcher to Jarrod Saltalamachia.
Split into simpler sentences: Lavarnway was called up to the majors in August and appeared in 46 games for the Red Sox. Lavarnway is currently serving as a back-up catcher for the Red Sox behind teammate Jarrod Saltalamachia.