Complex sentence: Evans designed the house at 237 S.21st Street as his own residence; the houses at 239 and 241 S.21st Street and the corner house at 2049 Locust Street were speculative properties that his family sold off.
Split into simpler sentences: Evans designed the house at 237 S.21st Street as his own residence. The houses at 239 and 241 S.21st Street and the corner house at 2049 Locust Street were speculative properties that his family sold off.