Complex sentence: An art lover, he frequented the Philippine Art Gallery, where he met the curator, Fernando Zóbel de Ayala y Montojo, who recommended Locsin to the Ossorio family, who was planning to build a chapel in Negros.
Split into simpler sentences: An art lover, he frequented the Philippine Art Gallery, where he met the curator, Fernando Zóbel de Ayala y Montojo. It was the latter who recommended Locsin to the Ossorio family that was planning to build a chapel in Negros.