Rather than (ahem) trying to wing it in one swoop, break it down into three smaller sections: the outer corners, the middle and the inner corners.
"sarupo iko se nak ambo alah bajalan pula ka arah Sungai Nanam kalau ambo caliak tampek tu sangek rancak untuak di buek gunuang, dan di alahan panjang ko ado pulo tigo bukik jadi katigo bukik ko bia lah niniak pindahan se ka Sungai Nanam untuak di jadian gunuang.