Complex sentence: Then, in the 19th century, it was revived as a spoken and literary language, and, according to Ethnologue, had become, as of 1998, the language of 5 million people worldwide.
Split into simpler sentences: Then, in the 19th century, it was revived as a spoken and literary language. According to Ethnologue, in 1998, it was the language of 5 million people worldwide.