Complex sentence: The morning prayer service is preceded by litanies and petitions of forgiveness called "selichot"; on Yom Kippur, many "selichot" are woven into the liturgy of the mahzor (prayer book).
Split into simpler sentences: The morning prayer service is preceded by litanies and petitions of forgiveness called "selichot". On Yom Kippur, many "selichot" are woven into the liturgy of the mahzor (prayer book).