Complex sentence: The goal of phase 2 trials is to grasp additional understanding of the study drug's safety and efficacy and to determine the appropriate dose to be administered to deliver the desired treatment effect while minimizing the safety risk of future research subjects.
Split into simpler sentences: The goal of phase 2 trials is to grasp additional understanding of the studied drug's safety and efficacy. It also determines the appropriate dose to be administered to deliver the desired treatment effect while minimizing the safety risk of future research subjects.