Complex sentence: It was constructed for Sir Thomas Tresham the fervent Roman Catholic of Rushton Hall and is thought to have been designed by Robert Stickells, the exact date is unknown, but can be estimated to circa 1604-05 the year if Tresham's death.
Split into simpler sentences: It was constructed for Sir Thomas Tresham, the fervent Roman Catholic of Rushton Hall, and is thought to have been designed by Robert Stickells. The exact date is unknown but can be estimated to circa 1604--05, the year of Tresham's death.