Complex sentence: Vietnam is an upcoming Vietnam War-themed tactical first-person shooter video game developed by Antimatter Games and Tripwire Interactive and will co-published by Tripwire Interactive and Iceberg Interactive.
Split into simpler sentences: Vietnam is an upcoming Vietnam War-themed tactical first-person shooter video game developed by Antimatter Games and Tripwire Interactive. It will be co-published by Tripwire Interactive and Iceberg Interactive.