Complex sentence: They are usually, phonologically speaking, analyzed not as phonemes of their own but as sequences of two monophthong phonemes, this in contrast to languages like English, where the diphthongs are best analyzed as independent phonemes (see International Phonetic Alphabet for English).
Split into simpler sentences: They are usually, phonologically speaking, analyzed not as phonemes of their own but as sequences of two monophthong phonemes. This is in contrast to languages like English, where the diphthongs are best analyzed as independent phonemes (see International Phonetic Alphabet for English).