Complex sentence: Some of these primitive fandangos from Málaga, called Verdiales are still performed nowadays at folkloric gatherings by large non-professional groups called "Pandas", which use a high number of guitars, "bandurrias" (a sort of mandoline), violins, and tambourines.
Split into simpler sentences: Some of these primitive fandangos from Málaga, called Verdiales are still performed nowadays at folkloric gatherings by large groups called "Pandas". They involve a high number of guitars, "bandurrias" (a sort of mandoline), violins, and tambourines.