Complex sentence: On October 1,2014, cinematographer Janusz Kamnski let slip that his next project is the upcoming Indiana Jones movie, although Steven Spielberg is working on two projects for the next few years, therefore pushing the earliest start on fifth Indiana Jones movie into 2017.
Split into simpler sentences: On October 1,2014, cinematographer Janusz Kamnski let slip that his next project is the upcoming Indiana Jones movie. This conflicts with Steven Spielberg's schedule though, as he is is working on two projects for the next few years, therefore pushing the earliest start on fifth Indiana Jones movie into 2017.