Complex sentence: The story behind the name change from Jusampura to Himmatpura is as follows: when the people heard of Guru Hargobind's approach, they gathered from far and wide to seek his blessings.
Split into simpler sentences: The story behind the change of name from Jusampura to Himmatpura is as follows. When they heard of Guru Ji's (GURU HARGOBIND JI) approach, people gathered from far and wide to seek his blessings.