If this doctor, who lived one block away from there, would have come 20 minutes earlier, not have to wait until that siren he heard before coming from the ambulance, if he would have heard about it way before, he would have saved this child.
Se este médico, que vivia à distância de um quarteirão, tivesse chegado 20 minutos antes, sem ter que esperar por ouvir  aquela sirene vinda da ambulância; se tivesse ouvido falar do  caso muito antes, teria salvo esta criança.