Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
pompo, no perf., ātum, 1, v. a., to make or do any thing with pomp (post-class.): grandisonis pompare modis, Sedul. 1, 2.
Hence, pompātus, a, um, P. a., magnificently ordered, pompous, splendid: pompatior suggestus, Tert. Spect. 7.