Complex sentence: Filming was due to began during pre-production on Skellig Michael in Ireland on September 14,2015, lasting four days, due to seasonal difficulties; however, filming was cancelled for the first day due to poor weather and rough conditions.
Split into simpler sentences: Filming was due to began during pre-production on Skellig Michael in Ireland on September 14,2015, lasting four days, due to seasonal difficulties. But filming was cancelled for the first day due to poor weather and rough conditions.