Complex sentence: Josephus relates that Antonia informed Tiberius of the conspiracy of Sejanus; and hence it has been conjectured that Secundus, unwilling or unable to have an interview with the emperor, had acquainted Antonia with the plot.
Split into simpler sentences: Josephus relates that Antonia informed Tiberius of the conspiracy of Sejanus. It has been conjectured that Secundus, unwilling or unable to have an interview with the emperor, had acquainted Antonia with the plot.