1.Heat Olive Oil In A Large Saucepan Over Medium Heat; Saute Onion And Garlic Until Onion Is Translucent. 2.Stir In Broth And Tomatoes; Sprinkle Basil Into Sauce And Season With Salt And Pepper To Taste. Simmer For 15 Minutes Over Medium-Low Heat. 3.Meanwhile, Bring A Large Pot Of Lightly Salted Water To A Boil. Add Pasta And Cook For 8 To 10 Minutes Or Until Al Dente; Drain And Place Pasta Into Serving Bowls. 4.Place Cooked Chicken In Sauce To Heat Through; Drop In Spinach Just Before Serving To Cook For 2 To 3 Minutes. 5.Spoon Sauce Over Hot Pasta And Sprinkle With Parmesan Cheese.