Complex sentence: Lee also suggests selling Joe's boat that he left for Patrick, as the motor is about to die and regular maintenance would be too costly, but are able to afford a new motor after selling Joe's hunting rifles.
Split into simpler sentences: Lee also suggests selling Joe's boat that he left for Patrick, as the motor is about to die and a new one would be costly. However, they are able to afford a new motor after Lee gets the idea to sell Joe's hunting rifles.