Break it up into two separate sentences and it's a lot easier.
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There is no penalty box in outdoor soccer. I believe there is for indoor soccer.
There is no specific collective noun for soccer balls, in which case a noun suitable for the situation is used; for example a sack of soccer balls, a bin of soccer balls, a rack of soccer balls, etc.
soccer.
Only Americans call soccer...soccer! (everywhere else it is known as football)
The duration of MLS Soccer Saturday is 3 hours.