This is a poem by Thomas Campion (1567-1620):
In Pseudomedicum
Invento ex libro medicus qui creditur esse,
Fortunae, non is filius artis erat.
The vocabulary is keyed to the DCC Latin Vocabulary list. There are only two words in this poem not on the DCC list:
medicus (medicī, m.): physician, doctor
pseudomedicus (pseudomedicī, m.): fake doctor, quack
ars artis f.: skill
crēdō crēdere crēdidī crēditum: believe
ex ē: out of, from (+ abl.)
filia -ae f.; filius -ī m.: daughter; son
fortūna -ae f.: fortune
in: in, on (+ abl.); into, onto (+ acc)
inveniō -venīre -vēnī -ventum: find; discover
is ea id: he, she, it
liber librī m.: book
nōn: not
qui quae quod: who, which, what / quis quid: who? what? which?
sum, esse, fuī: be, exist