Original sentence: But The Waterford Chronicle was able to report his presence at the St Valentine's Day Ball at Waterford Castle, giving him an alibi for the reported attacks on Jane Allsop and Lucy Scales that are central to Jack's alleged existence.Indeed, the Marquess was frequently in the news in the late 1830s for drunken brawling, brutal jokes and vandalism, and was said to do anything for a bet{[fact}}; his irregular behaviour and his contempt for women earned him the moniker "the Mad Marquis'''', and it is also known that he was in the London area by the time the first incidents took place.Spring Heeled Jack remained active for decades after, which leads the aforementioned modern researchers to the same conclusion as Brewer's: the Marquess may well have been responsible for the first attacks, and other pranksters occasionally imitated him thereafter.These authors speculate that he could have designed (with the help of friends who were experts in applied mechanics) some sort of spring-heeled boots, and that he may have practised fire-spitting techniques in order to increase his unnatural appearance
Edited sentence: But The Waterford Chronicle was able to report his presence at the St Valentine's Day Ball at Waterford Castle, giving him an alibi for the attacks on Jane Allsop and Lucy Scales that are central to Jack's authenticated history.Indeed, the Marquess was frequently in the news in the late 1830s for drunken brawling, brutal jokes and vandalism, and was said to do anything for a bet; his irregular behaviour and his contempt for women earned him the moniker "the Mad Marquis'''', and it is also known that he was in the London area by the time the first incidents took place.Spring Heeled Jack remained active for decades after, which leads the aforementioned modern researchers  to the same conclusion as Brewer's: the Marquess may well have been responsible for the first attacks, and other pranksters occasionally imitated him thereafter.These authors  speculate that he could have designed (with the help of friends  who were experts in applied mechanics) some sort of spring-heeled boots, and that he may have practised fire-spitting techniques in order to increase his unnatural appearance