Complex sentence: After their relegation, Cadú joined Boavista FC, where he was an automatic first-choice, appearing in 30 games, tallying two goals--in his first year, with the Porto club ranking in sixth position.
Split into simpler sentences: After their relegation, Cadú joined Boavista FC, where he was an automatic first-choice, appearing in 30 games. He scored two goals--in his first year, helping the Porto club finish in sixth position.