Complex sentence: Satellite imagery for the defense analysis industry showed the aircraft carrier in the early stages of hull assembly by March 2015; then followed by public photos of a hull with military characteristics at the Dalian shipyard surfaced on the Internet the next month.
Split into simpler sentences: Satellite imagery for the defense analysis industry showed the aircraft carrier in the early stages of hull assembly by March 2015. Public photos of a hull with military characteristics at the Dalian shipyard surfaced on the Internet the next month.