Complex sentence: It is not known exactly what role he played in this plot, but after its ensuing failure, he was arrested along with former Maryland governor, Josias Fendall (ca.1628-1687).
Split into simpler sentences: It is not known exactly what role he played in this plot. After the plot's failure, he was arrested along with former Maryland Governor, Josias Fendall (ca.1628-1687).