Complex sentence: Paris worked hard to earn his crewmates' respect; during this time, he became best friends with Ensign Harry Kim, a young officer on his first mission who defied his crewmates to befriend Paris.
Split into simpler sentences: Paris worked hard to earn his crewmates' respect. During this time, he became best friends with Ensign Harry Kim, a young officer on his first mission who defied his crewmates to befriend Paris.