Complex sentence: Among 29,450 square meter, GOR Jati facility comprises 4,925 square meter sport building with 16 courts inside--12 of them are covered with woods, others with vinyl (synthetic rubber).
Split into simpler sentences: Among 29,450 square meter, the GOR Jati facility comprises 4,925 square meter sports building with 16 courts inside. Twelve of them are surfaced with wood; the others with vinyl (synthetic rubber).