Preheat over to 450F. Cut pizza dough in half. Stretch pizza dough into rectangles on a floured surface. Put parchment paper on baking sheets and place pizza dough on sheets. Bake in oven until brown in spots about 8-10 minutes.
Meanwhile heat 1 Tbsp olive oil in a medium skillet over medium-high heat. Add the sausage and cook until no longer pink breaking up into pieces with a wooden spoon, about 4 minutes.
Sprinkle the crust with the cheese, top with the sausage and garlic. Return the pizza to the oven and bake until the cheese is bubbly, 5-8 minutes. Sprinkle with the oregano.
Meanwhile, make the salad. Soak the red onion in ice water for 10 minutes, then drain. Toss the spinach, fennel, red peppers, artichoke hearts and red onion in a large bowl with the vinegar and 1 Tbsp olive oil, season with salt and pepper.
Top the pizza with the salad and cut into pieces. Sprinkle with red pepper flakes. Enjoy!