Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
per-saepe, adv., very often, very frequently: quod persaepe fit, Cic. Lael. 20, 75: frons, oculi, voltus persaepe mentiuntur, id. Q. Fr. 1, 1, 5, § 15: persaepe velut qui Junonis sacra ferret, Hor. S. 1, 3, 10; id. A. P. 349.
In tmesi: per pol saepe peccas, Plaut. Cas. 2, 6, 18.