Complex sentence: Menotti grew up in the Fisherton district of Rosario, and played for local clubs before being picked up by a scout from Rosario Central, where he played in the youth divisions while attending high school (he graduated as a chemical technician).
Split into simpler sentences: Menotti grew up in the Fisherton district of Rosario, and played for local clubs before being spotted by a scout from Rosario Central. He played in the youth divisions while going to high school (he graduated as a chemical technician).