Complex sentence: In early 1928, Kishori Lal joined the Naujawan Bharat Sabha, thereby coming into direct and close contact with Bhagat Singh, the founder of the Sabha, which instilled revolutionary ideas among the youth and prepared them for the struggle for Indian freedom by violent means.
Split into simpler sentences: In early 1928, Kishori Lal joined the Naujawan Bharat Sabha, thereby coming into direct and close contact with the founder of the Sabha, Bhagat Singh. The Sabha instilled revolutionary ideas among the youth and prepared them for the struggle for Indian freedom by violent means.