In ordinary speech "that" can often be left out(=omitted)-- before a noun clause.It is usually left out in formal English, especially after a common saying"eg:-"Zack is the..."
Hence eg:-
Zack Efron is the kind of boy
that most boys would like to be---------
that most girls would like to meet-------
(two different ideas noun clauses)
Hence:-eg:-
Zack Efron is the kind of boy that most boys would like to be ________(leave blank) most girls would like to meet.
(two noun clauses )
Zack Efron is the kind of boy that most boys would like to be, ________ most girls would like to meet .
關鑑在於中間的逗點 "," 還原成囉嗦的完整句子
Zack Efron is the kind of boy that most boys would like to be, and (he is the kind of boy) that most girls would like to meet.
如果沒有逗點,就可直述如下
Zack Efron is the kind of boy that most boys would like to be and most girls would like to meet.