original: The Tuvaluan language is spoken by virtually everyone, while a language very similar to Gilbertese is spoken on Nui.
simplifications: The Tuvaluan language is spoken by everyone. Language similar to Gilbertese is spoken on Nui. Tuvaluan is a language spoken by almost everyone and is similar to Gilbertese. The Tuvaluan language is spoken by virtually everyone.  A language very similar to Gilbertese is spoken on Nui. Nearly everyone speaks the Tuvaluan language. Meanwhile, a language much like Gilbertese is spoken on Nui. Almost everyone speaks Tuvaluan.  However, a language very similar to Gilbertese is spoken in Nui. The Tuvaluan language is spoken by almost everyone. A language close to Gilbertese is spoken on Nui. The Tuvaluan language is similar to Gilbertese which is spoken by virtually everyone on Nui. Almost everyone speaks Tuvaluan. On Nui, people speak a language similar to Gilbertese. The Tuvaluan language is spoken by virtually everyone. A language very similar to Gilbertese is spoken on Nui. The Tuvaluan language is spoken by almost everyone. A language very similar to Gilbertese is spoken on Nui.