Simpson admits he could have stayed with the Gunners and fought for his place in the first-team. However, he says he benefited hugely from a similar loan spell at West Brom last season and wanted to play regular football again.
He said: "I could have stayed to fight for my place [at Arsenal] but I got used to playing regularly for West Brom and I wanted more of that.
"I didn't want to go back to playing a game here and there, or playing for the reserves, so I was ready to go on loan again. I am here to play football matches, win football matches and score goals - simple as that."