What is the simplest way to pray the rosery for indulgences?
There are several indulgences attached to the recitation of the rosary according to the Raccolta including an indulgence of 5 years or a plenary indulgence if recited daily for a month. There are additional indulgences granted when recited as a family under the usual conditions. The “usual conditions” for gaining an indulgence is to receive the sacraments of Penance and Holy Communion within the octave (8 days).
We must not forget that you receive the 15th promises that are attach to saying the Rosary daily.
If you pray the rosary daily, you’ll gain additional spiritual benefits by enrolling in the Confraternity of the Holy Rosary. There’s no reason not to join.