Complex sentence: Hausa has 5 phonetic vowel sounds which are both single and long, giving a total of 10 vowel phonemes which are called Monophthongs and 4 joint vowel sounds that are called Diphthongs giving a total number of 14 vowel phonemes.
Split into simpler sentences: Hausa has 5 phonetic vowel sounds, which can be either short or long, giving a total of 10 monophthongs. In addition, there are 4 joint vowels (diphthongs), giving a total number of 14 vowel phonemes.