Complex sentence: They then arrive to the Old West in 1873 where Hawkeye is lost in time and dinosaurs are released everywhere but Bob sends them back in time (including Thing and Hawkeye) but Hulkpool is sent when Captain America was losing Bucky and decides to save him.
Split into simpler sentences: They then arrive to the Old West in 1873, where Hawkeye is lost in time, and dinosaurs are released everywhere. However, Bob sends them back in time (including Thing and Hawkeye), but Hulkpool is sent when Captain America was losing Bucky and decides to save him.