"Post secundam horam prandium coquit."
Translation:After the second hour he cooks lunch.
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It tends to be omitted since the verb form will tell you the person (1st, 2nd, or 3rd person) and number (singular or plural) which the pronoun will also tell you.
In most contexts this is enough (maybe if the subject is general or specified beforehand) but the pronoun can be added for emphasis (maybe to clear up some ambiguities).