Complex sentence: Toponymists are responsible for the active preservation of their regions culture through its toponymy and typically ensure the on-going development of a geographical names data base and associated publications, for recording and disseminating authoritative hard-copy and digital toponymic data.
Split into simpler sentences: Toponymists are responsible for the active preservation of their regions culture through its toponymy. They typically ensure the on-going development of a geographical names data base and associated publications, for recording and disseminating authoritative hard-copy and digital toponymic data.