Complex sentence: Its dominical letter hence is G. The current year, 2018, is a common year starting on Monday in the Gregorian calendar, and the next such year will be 2029 or, likewise, 2013 and 2019 in the obsolete Julian calendar.
Split into simpler sentences: Its dominical letter hence is G. The current year, 2018, is a common year starting on Monday in the Gregorian calendar, and the next such year will be 2029. Likewise, 2013 and 2019 are common years starting on Monday in the obsolete Julian calendar.