Complex sentence: Francis received his early education in various traditional Catholic schools in Rio de Janeiro, afterwards attending classes at the National School of Philosophy (at the time a general humanities course) of the University of Brazil in the 1950s.
Split into simpler sentences: Francis received his early education in various traditional Catholic schools in Rio de Janeiro. After his early education, he attended classes at the National School of Philosophy (at the time a general humanities course) of the University of Brazil in the 1950s.