Complex sentence: There he learned the Cantonese dialect and opened many missions and churches, including San Francisco, Oakland, Stockton, Salinas, and in the gold fields in the foothills of California, also wrote a Chinese-English Dictionary and translated the New Testament into Cantonese.
Split into simpler sentences: There he learned the Cantonese dialect and opened many missions and churches, including San Francisco, Oakland, Stockton, Salinas, and in the gold fields in the foothills of California. He also wrote a Chinese-English Dictionary and translated the New Testament into Cantonese.