Why is causative form used here?

Question

The following is an excerpt from a reply from my language partner: アンドレアスさんの試みでは、対比させるには、例文が少し難しいと思います。

For context: I tried out a rather overcomplicated structure in passive voice because I wanted to see wether this is still grammatical/understandable or not. I also wrote down the same sentence in the active voice and I asked for her feedback.

Here are the 2 sentences (ridden with awful grammar):

passive voice:

例えば、チームのスパイ行為はチームにwhaleとsharkの言葉を選ばれるつもりだったら、「Fish, 2」という暗示を上げたらいいでしょう。この番号は代行者にスパイ行為が望言葉の分量を送ります。

Active voice:

例えば、チームのスパイ行為はチームがwhaleとsharkの言葉を選ぶつもりだったら、「Fish, 2」という暗示を上げたらいいでしょう。この番号は代行者にスパイ行為が望言葉の分量を送ります。

So, back to the sentence in question, here is my attempt at translation: "Concerning your experiment, ? comparison ? I think the example sentence is a bit difficult."

I don't know what to do with this causative verbform. I know it in context of sentences like these: 先生が学生に宿題をたくさんさせた。-> "The teacher made the students do lots of homework." But in context of the sentence in question, I really have no idea how whoever has made whoever make a comparison xD I also don't really know what to make of this second は in 対比させるには

Answer 1

アンドレアスさんの試みでは、対比させるには、例文が少し難しいと思います。
I think your example sentence is a bit too difficult (for me) to make a (good) comparison (between passive voice and active voice).

So you're mainly interested in voices (passive/active interchangeability), but she said "your example sentence is too difficult to discuss about that" Actually, your example sentence has a number of more basic errors, and she thought you needed to start with simpler sentences.

• 対比させる and 対比する are interchangeable in this context. See this similar question: Difference between 完成させる and 完成する (transitive usage only)
• に after 対比させる is the purpose marker (="to", "in order", "for").
• は after that is another topic/contrast marker. See: Can we have two thematic は particles in a sentence?