Complex sentence: It will be held at the Valkenswaard track in The Netherlands on 27--28 March 2016 and will include the third rounds of the 2016 MXGP and MX2 world championships.
Split into simpler sentences: It will be held in Valkenswaard, Netherlands on 27--28 March 2016. The race will include the third rounds of the 2016 MXGP and MX2 world championships.