Complex sentence: Since the beginning of his career as a singer, in 2010, Mars has sold 8 million albums and 58 million singles worldwide as a singer, although as a songwriter, producer and singer, his total single download sales surpass 100 million worldwide.
Split into simpler sentences: Since the beginning of his career as a singer, in 2010, Mars has sold 8 million albums and 58 million singles worldwide as a singer. Although as a songwriter, producer and singer, his total single download sales surpass 100 million worldwide.