This is the third item in the list. It can be written with the verb "were." Alternate translation: "The leaders of the descendants of David were Hattush who was ... Parosh; and Zechariah" or "The leaders of the descendants of David were Hattush and Zechariah. Hattush was from ... Parosh"
This can be written as a separate sentence after "Zechariah." Alternate translation: "Hatush was a descendant of Shecaniah, who was a descendant of Parosh"