Rearrange the parts to make a meaningful sentence.

P. it was not until

Q. the farmers began to worry

R. the rains had failed

S. for two years that

Explanation

1. 01

   "It was not until ... that" is a fixed frame: P opens it, and "until" needs an event: R "the rains had failed".

2. 02

   S says for how long and brings "that", followed by the main event: Q.

3. 03

   So the order is PRSQ: "It was not until the rains had failed for two years that the farmers began to worry."