Complex sentence: In a reciprocating piston engine, the connecting rod or conrod connects the piston to the crank (crankshaft) with the crank, they form a simple mechanism that converts linear motion into rotating motion.
Split into simpler sentences: In a reciprocating piston engine, the connecting rod or conrod connects the piston to the crank or crankshaft. Together with the crank, they form a simple mechanism that converts linear motion into rotating motion.