Complex sentence: Alexander Rossi (born September 25,1991) is an American professional racing driver who currently races in the IndyCar Series for Bryan Herta Autosport with Andretti Autosport and current reserve driver for Manor Racing in Formula One.
Split into simpler sentences: Alexander Rossi (born September 25,1991) is an American professional racing driver. He currently races in the IndyCar Series for Bryan Herta Autosport with Andretti Autosport; additionally, he serves as reserve driver for Manor Racing in Formula One.