Complex sentence: In phonology, there is a subfield of segmental phonology that deals with the analysis of speech into phonemes (or "segmental phonemes"), which correspond fairly well to phonetic segments of the analysed speech.
Split into simpler sentences: In phonology, there is a subfield of segmental phonology. It deals with the analysis of speech into phonemes (or "segmental phonemes"), which correspond fairly well to phonetic segments of the analysed speech.