Complex sentence: When he was 23 Kamhi decided to build for himself additional floor on his father's house and hired Fidan Gruev from Smilevo who introduced him with his brother, Dame Gruev.
Split into simpler sentences: When he was 23 Kamhi decided to build for himself additional floor on his father's house. Later he hired Fidan Gruev from Smilevo who introduced him with his brother, Dame Gruev.