Complex sentence: The schwa (in the center of the diagram beside this paragraph) is not necessarily a distinctive sound; even though it is often realized as other vowels, its patterning suggests that it is a separate phoneme (see the sub-section Schwa below).
Split into simpler sentences: The schwa (in the center of the diagram next to this paragraph) is not necessarily a distinctive sound. Even though it is often realised as other vowels, its patterning suggests that it is a separate phoneme (see the sub-section Schwa below).