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The Sistine Chapel is a grand chapel built inside the Vatican Palace in 1473.
Literal
Sistine-Chapel [topic-は], 1473 [in-に] Vatican-Palace-inside [at-に] was-erected grand chapel is.
An encyclopedic description. 建立する (こんりゅうする) is a formal verb meaning 'to erect, to build' — used specifically for important buildings like temples, shrines, churches, and monuments. The passive 建立された ('was erected') is used because the agent (who built it) isn't the focus. 壮大 ('grand, magnificent, majestic') is a な-adjective for describing impressive buildings, landscapes, or ambitions. The whole sentence packs three modifiers into a relative clause before 礼拝堂 ('chapel'): 1473年に (when), バティカン宮殿内に (where), and 建立された (what happened to it) — standard dense Japanese encyclopedic construction.