Complex sentence: Markus Alexej Persson (born 1 June 1979), also known as Notch or xNotch, is a Swedish video game programmer and designer who founded the video game company Mojang alongside Carl Manneh and Jakob Porser in late 2010.
Split into simpler sentences: Markus Alexej Persson (born 1 June 1979), also known as Notch or xNotch, is a Swedish video game programmer and designer. Persson is known as the founder of Mojang, the video game company he founded alongside Carl Manneh and Jakob Porser in late 2010.