Complex sentence: It is one of the major roads leading out of Thane city and connects to the Eastern Express Highway which becomes National Highway 3 at Thane and the Western Express Highway which becomes National Highway 8 at Ghodbunder leading to Gujarat.
Split into simpler sentences: It is one of the major roads leading out of Thane city and connects to the Eastern Express Highway, becoming National Highway 3. It also connects to the Western Express Highway to become National Highway 8 at Ghodbunder leading to Gujarat.