Complex sentence: The strength in Frederick and his partner's work lied in their knack for lyric-heavy, uplifting compositions with a common theme between most: that of realizing one's dreams, and making a success out of one's life.
Split into simpler sentences: The strength in Frederick and his partner's work lied in their knack for lyric-heavy, uplifting compositions. There was a common theme between most: that of realizing one's dreams, and making a success out of one's life.