Array.prototype.concat.applyを使う。
var ary = [[1,2,3,4,5,6,7],[8,9,10],[11,12]];
var ary2 = Array.prototype.concat.apply([],ary);
/*
ary2 == [1,2,3,4,5,6,7,8,9,10,11,12];
*/
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