Complex sentence: Solaria was the last of fifty Spacer worlds colonized by humans in the first wave of interstellar settlement, occupied from approximately 4270 AD by inhabitants of the neighboring world Nexon originally for summer homes.
Split into simpler sentences: Solaria was the last of fifty Spacer worlds colonized by humans in the first wave of interstellar settlement. Occupied from approximately 4270 AD by inhabitants of the neighboring world Nexon originally for summer homes.