How many orders were made by Maxwell Schwartz in 2015?
Maxwell Schwartz' is the "Customer Name"; in 2015 refers to strftime('%Y', "Order Date") = '2015';
SELECT COUNT(DISTINCT T1.`Order ID`) FROM east_superstore AS T1 INNER JOIN people AS T2 ON T1.`Customer ID` = T2.`Customer ID` WHERE T2.`Customer Name` = 'Maxwell Schwartz' AND STRFTIME('%Y', T1.`Order Date`) = '2015'