Complex sentence: Given C $6,000 by his mother to build a house, he sold it for $13,000 before she could even move in and, he has stated, "discovered right then how easy it was to make money in the real-estate business".
Split into simpler sentences: Given C $6,000 by his mother to build a house, he sold the finished product for $13,000 before she had moved in. He later claimed he "discovered right then how easy it was to make money in the real-estate business".