Someone (om-, mang-) levels something (-en).
simpá
patag, tatág
Yaken omsimpa siras bato saya tan dyi sa mabadede.
I level the rocks so they do not roll.
Simpaen mo parey mwaya, ta dyirig.
Level the post, because it is tilted.
1
Something (mag-) becomes level.
An dya magsimpaw tanaya, maranoman aba.
Unless the land becomes level, (it) cannot be watered.
2
A couple (mag) decides to get married.
Magsimpa dana sa.
They already decide to get married.