Modern speakers of Slovak tend to ignore the distinction between hard and soft "l"s. Krasula in Slovak is pronounced "KRAH-soo-lah"; the surname was probably originally Krasul'a, pronounced "KRAH-soo-lyah," which is a Slovak word (from "krasa" = beauty) meaning a pretty woman. The spellings that generate the same pronunciations in Magyar/Hungarian are Kraszula and Kraszulya. (A simple "s" in Slovak and the combination "sz" in Magyar are pronounced as the "s" in English.)
The surname Sipos is more difficult. The ending suggests to me it may be Magyar in origin. If so, the simple "s" would have been pronounced as "sh" in English and "s" with a small "v" over it in Slovak. As the surname became Slovakiazed, some may have spelled it with the original simple "s," while others may have added the diacritical mark to maintain the original pronunciation.