Change in plant after 8 yrs.

[New Orchid Lover]

I've had this orchid for 8 yrs and it was doing very well and blooming once or twice a year. In the last month, the leaves started to wrinkle even though I didn't change how I cared for the plant. My question is two-fold....1) how to I repot the orchid to get rid of the tree like center of the plant, and also 2) what can I do about it's leaves darkening and wrinkling.

Thanks much.