Complex sentence: The nave and chancel roofs were painted by Mildred Holland, the wife of the Rector, in the style of the 15th century, over a period of seven years starting in 1859.
Split into simpler sentences: The nave and chancel roofs were painted by Mildred Holland, the wife of the Rector. They were painted in the style of the 15th century and were completed over a period of seven years starting in 1859.