You should add either Father and/or "S.J." at several points to several people - SJ would be easier.
Round "Wisbech stirs" - need to explain that the CC had not appointed catholic bishops to the English sees since the death of Mary I, & had ?when placed the Jesuits in overall charge of the English Mission. "They wanted the society's administration of continental seminaries ended, the Jesuits removed from the Catholic mission, and the restoration of ordinary episcopal governance in England.[nb 1] In spring 1598, Rome made George Blackwell archpriest in England, provided him with twelve assistants, and urged him to take advice from the Jesuit superior. This role fell to Garnet. Robert Parsons, disliked by the Appellants,[4] was made prefect in England by Acquviva, and Joseph Creswell and William Holt vice-prefects on the continent. Not everybody was happy with Rome's actions; some accused the English Jesuits of foisting a puppet on the English church, while claiming that they were loyal Catholics, as opposed to Jesuit traitors. Supporters of Blackwell called these claimants scismatics. The matter was finally resolved in October 1602. A papal brief affirmed the new structure. It removed the requirement for the archpriest to consult with the Jesuit superior, while keeping Jesuits in the mission. The appellants' hopes that the English government might support them were confounded on 5 November, when a royal proclamation ordered appellants and Jesuits out of the country.[1] " - all rather confusing, especially "some accused the English Jesuits of foisting a puppet on the English church, while claiming that they were loyal Catholics, as opposed to Jesuit traitors" - Who, what?
You want to get some sources that aren't just about the Gunpowder plot. I see there is "Henry Garnet: 1555-1606 and the Gunpowder Plot", by Philip Caraman SJ, presumably a full bio, if no doubt partisan. John Bossy, of "The English Catholic community, 1570-1850" and other works, is the senior figure in the field, but there are others. He spent 14 years in England after his return from Europe.
Some of the "superiors", "prefects" etc are confusing - presumably ad hoc managerial titles rather than regular ranks. Nowadays Jesuits have a "Provincial" in charge of eg England & Wales or Scotland, which is effectively what Garnet was, but I don't know if that was his title then.
Was he baptised as a Catholic in Rome? Need to be clear.
