simplevisor: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/simplevisor - from package: python-simplevisor

You may install the required package with command yum install {package}

Error in other languages:
simplevisor: bevel nie gevind nie
simplevisor: comandă negăsită
simplevisor: comando não encontrado
simplevisor: commande introuvable
simplevisor: command not found
simplevisor: käsku ei ole
simplevisor: không tìm thấy lệnh
simplevisor: komanda nerasta
simplevisor: Kommando nicht gefunden.
simplevisor: kommandot finns inte
simplevisor: komut yok
simplevisor: nie znaleziono polecenia
simplevisor: níor aimsíodh an t-ordú
simplevisor: no se encontró la orden
simplevisor: no s'ha trobat l'ordre
simplevisor: opdracht niet gevonden
simplevisor: parancs nem található
simplevisor: perintah tidak ditemukan
simplevisor: príkaz nenájdený
simplevisor: příkaz nenalezen
simplevisor: команда не найдена
simplevisor: командата не е открита
simplevisor: 命令找不到
simplevisor: コマンドが見つかりません