Complex sentence: The stadium was built in 1976 in preparation for the 1978 World Cup, with a capacity for 46,083 spectators although it doesn't provide seating for all of them, like many Argentine stadiums.
Split into simpler sentences: The stadium was built in 1976 in preparation for the 1978 World Cup. It has capacity for 46,083 spectators although it doesn't provide seating for all of them, like many Argentine stadiums.