Complex sentence: To be transitive a verb must have both an active and passive form, which means that it can take the transitive prefix or the intransitive prefix, depending on if it is being used in an active sentence or a passive.
Split into simpler sentences: To be transitive a verb must have both an active and passive form. This means that they can take the transitive prefix or the intransitive prefix, depending on if it is being used in an active sentence or a passive.