Complex sentence: Production of "Infinity War" began on January 23,2017, at Pinewood Atlanta Studios in Fayette County, Georgia, with additional filming taking place in Scotland, shooting back-to-back with its untitled sequel beginning filming in August 2017.
Split into simpler sentences: Production of "Infinity War" began on January 23,2017, at Pinewood Atlanta Studios in Fayette County, Georgia, with additional filming taking place in Scotland. The untitled sequel will be filmed back-to-back with "Infinity War", beginning in August 2017.