Breakdown of kono natsu, kaigairyokou o surukoto ni suru.
このkono
this ... adnominal
夏natsu
summer
〜こと〜koto
thing; situation; verb nominalizer
〜 に する〜 ni suru
to decide on ~
海外旅行 を するkaigairyokou o suru
to travel abroad
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