one or on, for over a century

[user_gary]

Merlin had used only two wheels for each shoe, one at the front and one at the back. Many people tried to improve on his design by providng more wheels or by changing the position of the wheels on the shoes. But none succeeded in making safe rollerskates - the skates you can put a break on or on which you can turn around. For over a century, rollerskates were more dangerous than fun.

Please explain the `on or on', and also does the phrase `for over a century' mean `for more than century'?

Please explain me.

[engee30]

Merlin had used only two wheels for each shoe, one at the front and one at the back. Many people tried to improve on his design by providng more wheels or by changing the position of the wheels on the shoes. But none succeeded in making safe rollerskates - the skates you can put a break on or on wh0cih you can turn around. For over a century, rollerskates were more dangerous than fun.

Please explain the `on or on', and also does the phrase `for over a century' mean `for more than century'?

Please explain me.

should be '...the skates you can put a brake on' = the skates with a brake that you can apply when you want to stop
or on which you can turn around = or on the skates that you can turn around, on the skates that can allow you to turn around
for over a century = for more than 100 years, for more than a century

___________________________
NOTE:
Bear in mind I'm not a teacher!

[user_gary]

Thank you Engee30 for your help in my threads.

[engee30]

Thank you Engee30 for your help in my threads.

That's all right. I'm going to help you as long as I can.