Complex sentence: Mydin's business began to prosper after Dato' Haji Ameer Ali joined the family business in 1986 where he opened his wholesale shop at Jalan Masjid India, Kuala Lumpur.
Split into simpler sentences: Mydin's business began to prosper when Dato' Haji Ameer Ali joined the family business in 1986. He opened his wholesale shop at Jalan Masjid India, Kuala Lumpur.