Complex sentence: Madrid start playing for the young division of CA Platense debuting professionally in 1998, and in Argentine first division for Gimnasia y Esgrima La Plata in the 2000/2001 season.
Split into simpler sentences: Madrid start playing for the young division of CA Platense debuting professionally in 1998. He made his Argentine first division debut for Gimnasia y Esgrima La Plata in the 2000/2001 season.