。
We watched Mac make a brilliant shot.
Literal
We [topic-は] Mac [subject-が] splendid shot [object-を] decide [nominalizer-の]-[object-を] saw.
A nominalized embedded perception clause. マックがすばらしいシュートを決める ('Mac makes a brilliant shot') is nominalized with の and made the object of 見る. シュートを決める ('score a shot / make the shot count,' lit. 'decide the shot') is a sports set phrase; シュート is a katakana loanword from English.