Simplify the following text for a Grade 10 native English-speaking person.
Original: Zub is a game written for the Amstrad CPC , Commodore 64 and ZX Spectrum which was published in 1986 by Mastertronic and was written by John and Ste Pickford on the ZX Spectrum and Phillip Brian Allsopp on the Commodore 64 with music on all formats composed by David Whittaker .
Simplified: Zub is a computer game made for use on the Commodore 64 and ZX Spectrum computers which was released in 1986 by Mastertronic . The code was written by John and Ste Pickford on the ZX Spectrum and Phillip Brian Allsopp on the Commodore 64 , and the music was composed by David Whittaker .