To make the topping: combine the oats, ½ cup brown sugar, ¼ cup flour, slivered almonds, and ¼ teaspoon cinnamon. Cut in the butter until the mixture resembles coarse crumbs; set aside.
Roll out the pie dough into a circle and transfer it to a 9-inch pie plate.
Trim the pastry and crimp the edge.
Toss the apples with the lemon juice in a bowl to prevent browning.
Combine the 1 tablespoon flour, ½ cup brown sugar, and 2 teaspoons cinnamon; toss with the apples to coat.
Drizzle ¼ cup of caramel sauce over the bottom of the pie shell. Add the spiced apple mixture; drizzle with remaining ¼ cup of caramel sauce. Sprinkle the crumble topping evenly over the apples.
Bake the pie in the preheated oven for 50-60 minutes, or until the apples are tender and the crust is browned.