Complex sentence: The general form is a large gable roof with a square centered tower at the front (pictured), a rose window high on the tower, above that a belfry clad in ornamental sheet metal, then a slate-roofed spire topped with a Latin cross.
Split into simpler sentences: The general form is a large gable roof with a square centered tower at the front (pictured). High in the tower is a rose window, above that a belfry clad in ornamental sheet metal, and then a slate-roofed spire topped with a Latin cross.