Complex sentence: He belonged to the Nationalist Group and introduced Vishnu to his associates one of them was Hari Laxman Patil, a lawyer from Vasai, with who Vishnu came to form a close friendship.
Split into simpler sentences: He belonged to the Nationalist Group and introduced Vishnu to his associates. One of them was Hari Laxman Patil, a lawyer from Vasai, with whom Vishnu came to form a close friendship.