Complex sentence: The winners of Primera D gain automatic promotion to Primera C Metropolitana, the 5 highest finishers behind the champions go into a playoff series, the winner of which will face the 2nd worst team from Primera C in a promotion/relegation playoff.
Split into simpler sentences: The winners of Primera D gain automatic promotion to Primera C Metropolitana. The club finishing in 2nd to 6th place behind enter a playoff series; the winner of which faces the club finishing second bottom in Primera C Metropolitana in a promotion/relegation playoff.