Original sentence: This dish is popular in the Netherlands and Flanders and it is highly probable that it was developed by Chinese cooks either in the former Dutch East Indies (present day Indonesia) or in the Netherlands itself.This sauce is somewhat similar to other tomato-based sweet and sour sauces common in Chinese cuisine
Edited sentence: It is highly probable that the dish was developed by Chinese cooks; either in the former Dutch East Indies (present day Indonesia) or in the Netherlands itself after the large influx of Asians following World War 2.The sauce is somewhat similar to other tomato-based sweet and sour sauces common in Chinese cuisine.This particular dish has been made popular in the Netherlands and Flanders through so-called "Chinese-Indonesian restaurants"