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学校の窓ガラスを割った生徒に反省文を書かせました The key grammar point you are looking for is "relative clause". The main sentence here is: 生徒に反省文を書かせました He/she/the teacher made the student write an apology We can describe what kind of student it was with a relative clause (the part in bold): 学校の窓ガラスを割った生徒 The student who broke the school's window The whole relative ...


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You aren't wrong that there are two objects marked by を, but there are also two verbs, 割った and 書かせました. This should give you a clue that the sentence is complex in some sense. The reason is that the first part of your sentence is a noun phrase (a relative clause). Looking at this example, it is the noun 生徒 that is being modified to give you a more complex ...


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