Complex sentence: Among the local talents that Rivero and Torregrosa discovered was Juan Boria, a Puerto Rican poet who would become known for his Afro-Caribbean poetry, who in 1941, was participating in a show in the town of Loíza.
Split into simpler sentences: Among the local talents that Rivero and Torregrosa discovered was Juan Boria, a Puerto Rican poet who would become known for his Afro-Caribbean poetry. In 1941, Boria was participating in a show in the town of Loíza.