Complex sentence: The new album has been described as an introspective, withdrawn, atmospheric counterpart to energetic "Junior", which is supposed to have a "autumn mood" to it, while "Junior" has a "spring feel".
Split into simpler sentences: The new album has been described as an introspective, withdrawn, atmospheric counterpart to energetic "Junior". The album is supposed to have a "autumn mood" to it, while "Junior" has a "spring feel".