Complex sentence: The work deals with agriculture in calendars, ie catalogs of rules and machines, to perform monthly tasks in the various peasant offices; in particular it describes the calendarof the digger, that is, its tasks divided into several months of the year.
Split into simpler sentences: The work deals with periodic agriculture events, i.e. catalogs of rules and machines, to perform monthly tasks in the various peasant offices. In particular it describes the calendar of the digger, that is, its tasks divided into several months of the year.