Complex sentence: The two extraterrestrial fix-its then take residence in the apartment building, give birth to three baby fix-its, and later invite countless other fix-its to the apartment they have made their home for a mass restoration project after the building burns down.
Split into simpler sentences: The two extraterrestrial fix-its then take residence in the apartment building and give birth to three baby fix-its. Later, the family of fix-its invite countless other fix-its to the apartment they have made their home for to rebuild after the building burns down.