Original: And so in the encyclical letter Annum Sacrum (on May 25, 1899) this same pope decreed that the consecration of the entire human race to the Sacred Heart of Jesus should take place on June 11, 1899.
Simplified: Finally, by order of Leo XIII, in his encyclical "Annum Sacrum" (May 25, 1899), as well as on June 11, he consecrated every human to the Sacred Heart.