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万博終わり、混雑する夢洲駅で警備員さんが「すみません!!
→ “After the Expo, at the crowded Yumesaki Station, a security guard said 'Excuse me!!'”
万博 banpaku = World Expo (n.)
終わり owari = end / conclusion (n.)
、 = comma (punctuation)
混雑 konzatsu = crowding / congestion (n.)
する suru = to make / to cause (v.)
夢洲 yumesaki = Yumesaki (proper noun)
駅 eki = station (n.)
で de = at / in (location particle)
警備員 keibiin = security guard (n.)
さん san = -san (honorific suffix)
が ga = subject marker particle
「 = opening quotation mark
すみません sumimasen = excuse me / sorry (phrase)
!! = exclamation marks (punctuation)