Complex sentence: None of these three languages are mutually intelligible amongst each other, but the linguistic diversity of some regions has resulted in a segment of the population becoming fluent in speaking up to four languages, when Mandarin is included.
Split into simpler sentences: None of these three languages are mutually intelligible amongst each other. The linguistic diversity of some regions has resulted in a segment of the population becoming fluent in speaking up to four languages, when Mandarin is included.