Complex sentence: In 1848, Brown published an Assamese grammar, followed by an Assamese translation of the New Testament in 1850, and in the same year, Brown returned to America to join his brother William in the growing abolitionist movement.
Split into simpler sentences: In 1848, Brown published an Assamese grammar, followed by an Assamese translation of the New Testament in 1850. This same year, Brown returned to America to join his brother in William in the growing abolitionist movement.