Complex sentence: At the age of eight, Modi came in contact with RSS and he began attending its local shakhas where he came in contact with Lakshmanrao Inamdar, popularly known as "Vakil Saheb", who is known as his political guru and mentor.
Split into simpler sentences: At the age of eight, Modi came into contact with the Rashtriya Swayamsevak Sangh (RSS) and began attending its local "shakhas". There, he met Lakshmanrao Inamdar, popularly known as Vakil Saheb, who was to become Modi's political guru and mentor.