Complex sentence: The building itself was built in the nineteenth century as Westover Methodist Church and was later sold to the Orthodox Church, at which time it underwent significant alterations to bring it to the architectural standards necessary for an Orthodox house of worship.
Split into simpler sentences: The building itself was built in the nineteenth century and originally housed the Westover Methodist Church. It was later sold to the Orthodox Church, at which time it underwent significant alterations to bring it to the architectural standards necessary for an Orthodox house of worship.