Complex sentence: Tomislav "Tomo" Miličević (born September 3,1979) is an American musician and record producer best known as the lead guitarist of rock band Thirty Seconds to Mars.
Split into simpler sentences: Tomislav "Tomo" Miličević (born September 3,1979) is an American musician and record producer. He serves as the lead guitarist of rock band Thirty Seconds to Mars.