Complex sentence: It is the most widely spoken constructed language in the world: up to 2,000,000 people worldwide, to varying degrees, speak Esperanto, including about 1,000 to 2,000 native speakers who learned Esperanto from birth.
Split into simpler sentences: It is the most widely spoken constructed language in the world. Up to 2,000,000 people worldwide, to varying degrees, speak Esperanto, including about 1,000 to 2,000 native speakers who learned Esperanto from birth.