Complex sentence: He articled for Edward Greenspan and Marc Rosenberg in 1990 and then practiced law at the firm of Greenspan, Rosenberg and Buhr, becoming a partner in 1998.
Split into simpler sentences: He articled for Edward Greenspan and Marc Rosenberg in 1990. He then practiced law at the firm of Greenspan, Rosenberg and Buhr, becoming a partner in 1998.