In 1929, a national league was created and Real Sociedad participated in La Liga's first edition, finishing fourth out of the ten teams competing.

In 1934, Bienzobas joined CA Osasuna, at the time in Segunda División,[2] helping the Navarrese club immediately achieve promotion, only to be being relegated back the next season.

The Spanish Civil War put a stop to his career for three years and subsequently he returned to Real Sociedad in 1940,[2] retiring from football at the end of 1941–42 (aged 33) after making only five appearances during the campaign.

In 1942 he began a referee in a spell that would eventually feature him in 48 Spanish top flight games, his debut coming in 1948.

[1][2] Paco Bienzobas had two brothers who were also footballers:[2] the older Custodio, a forward, was a teammate at Real Sociedad for two seasons;[6] the younger Anastasio (Cuqui), a midfielder, also started his career at the Txuriurdin club but became established at Osasuna where he was joined by Paco, and after the Spanish Civil War was a regular in the team at Deportivo La Coruña for most of the 1940s.