Complex sentence: In January 2014 "Zumwalt" began to prepare for heavy weather trials, to see how the ship and her instrumentation react to high winds, stormy seas, and adverse weather conditions.
Split into simpler sentences: In January 2014, "Zumwalt" began to prepare for heavy weather trials. The trials will see how the ship and her instrumentation react to high winds, stormy seas, and adverse weather conditions.