Complex sentence: Joseph, an Irishman and like Calvert a Catholic, was a strong supporter of the King, and asked the Assembly soon after his arrival to create a holiday on the date of the birth of James II's heir.
Split into simpler sentences: Joseph, an Irishman and like Calvert a Catholic, was a strong supporter of the King. Soon after his arrival, he asked the Assembly to create a holiday on the date of the birth of James II's heir.