READ OUT LOUD. Choose which marked text you prefer to practice with - macrons or accent marks - and read the text out loud until you feel comfortable and confident. Then, try reading the unmarked text at the bottom. It should be easy for you after practicing with the marked texts. :-)
MACRONS. Here is the text with macrons:
Convēnēre Leō et Ovis et aliī Quadrupedēs, pepigerantque inter sē vēnātiōnem fore commūnem. Ītur vēnātum; prōcumbit cervus; spolia dīvidunt, singulās singulīs partēs tollere incipientibus. Irrūgiēns surgit Leō: “Ūna (inquit) pars mea est, quia sum dignissimus. Altera item mea est, quia vīribus sum praestantissimus. Porrō, quia in capiendō cervō plūs sūdāverim, tertiam mihi partem vendicō. Quartam dēnique partem, nisi concesseritis, actum est dē amīcitiā; īlicet periistis!” Relīquī, hōc audītō, discēdunt, vacuī et tacitī, nōn ausī muttīre contrā Leōnem.
ACCENT MARKS. Here is the text with ecclesiastical accents, plus some color-coding for the words of three or more syllables (blue: penultimate stress; red: antepenultimate stress):
Convenére Leo et Ovis et álii Quadrúpedes, pepigerántque inter se venatiónem fore commúnem. Itur venátum; procúmbit cervus; spólia dívidunt, síngulas síngulis partes tóllere incipiéntibus. Irrúgiens surgit Leo: “Una (inquit) pars mea est, quia sum digníssimus. Áltera item mea est, quia víribus sum praestantíssimus. Porro, quia in capiéndo cervo plus sudáverim, tértiam mihi partem véndico. Quartam dénique partem, nisi concesséritis, actum est de amicítia; ílicet periístis!” Relíqui, hoc audíto, discédunt, vácui et táciti, non ausi muttíre contra Leónem.
UNMARKED TEXT. Here is the unmarked text - after practicing with the marked text that you prefer, you should not have any trouble with the unmarked text:
Convenere Leo et Ovis et alii Quadrupedes, pepigerantque inter se venationem fore communem. Itur venatum; procumbit cervus; spolia dividunt, singulas singulis partes tollere incipientibus. Irrugiens surgit Leo: “Una (inquit) pars mea est, quia sum dignissimus. Altera item mea est, quia viribus sum praestantissimus. Porro, quia in capiendo cervo plus sudaverim, tertiam mihi partem vendico. Quartam denique partem, nisi concesseritis, actum est de amicitia; ilicet periistis!” Reliqui, hoc audito, discedunt, vacui et taciti, non ausi muttire contra Leonem.
IMAGE. Here is an illustration for the story (image source).