Theory:

     As they walked across the grass he spotted a stone bench under a mango tree. It was the bench on which his grandmother used to rest, when she was tired of pruning rose bushes and bougainvillea. ‘Let’s just sit here,’ he said. ‘I don’t want to go inside.’

     She sat beside him on the bench.

     They were silent for some time. The man closed his eyes and remembered other times - the music of a piano, the chiming of a grandfather clock, the constant twitter of budgerigars on the veranda, his grandfather cranking up the old car....
Explanation:
 
As the man was walking on that grass, he saw a stone bench under a mango tree. It was the same bench where his grandmother used to rest when tired of trimming roses and bougainvillea. He just wanted to sit there for a while and will get inside the house later.
 
The girl sat beside the man on the bench.
 
They both were silent for some time. The man closed his eyes and was trying to recollect whatever happened in those days like the music of piano playing, the grandfather's clock which made a music or sound to indicate the time, the birds continuously chirping on the roofed platform along the outside of a house, his grandfather's car cranking and so on.
 
Meanings of difficult words:
 
Number
Word
Meanings
1.
 Pruning  Trimming.
2.
 Chiming  Making ding-dong sound of a clock.
3.
 Budgerigars A small gregarious Australian parakeet which is green with a yellow head in the wild.
4.
 Cranking  Sound made by the engine before starting.
Reference:
State Council of Educational Research and Training (2018). Term-1 English Standard-9. I Can’t Climb Trees Anymore - Ruskin Bond (Slightly adapted) (pp. 157-160). Published by the Tamil Nadu Textbook and Educational Services Corporation.