Complex sentence: Blok, who is sleep-deprived and eliciting concern in the rest of the crew, sees a light outside the ship, but he is unable to record it or otherwise convince the crew of its occurrence.
Split into simpler sentences: Blok, who is sleep-deprived and eliciting concern in the rest of the crew, sees a light outside the ship. However, he is unable to record it or otherwise convince the crew of its occurrence.