Complex sentence: On 1952 the organizers of the first Campionat Nacional d'Escala i Corda assigned him a bad "mitger" as a partner for his team, he disagreed and decided not to take part, so he was banned for 3 months from all trinquets.
Split into simpler sentences: On 1952 the organizers of the first Campionat Nacional d'Escala i Corda assigned him a bad "mitger" as a partner for his team. He declined to take part, so he was banned for 3 months from all trinquets.