There is no break in a sentence. Words are separated by a dot or a small triangle. The inscription on the Arch at Beneventum is in wonderful repair and an excellent place to begin. With the use of keys, some Latin inscriptions might be more readily deciphered, but you will always encounter some where constructive quessing is needed. Letters are worn or missing, abbreviations do not follow normal structure etc.
Names are relatively easy to decipher.
Some others take more time. This chart of common abbreviations is taken from Introduction to the Study of Latin Inscriptions by James Egbert published in 1923. Following this is a table of some of the abbreviations used by Emperors , taken from the same text. The earliest inscriptions appear quite crude. On a pillar, marking a grave at Pisurum, written between sometime after the formation of the republic.