Complex sentence: It was invented by Roy Grabenauer in 1968 after years of experimenting with a variety of designs and innovative technologies, although Tim Niemier is celebrated as having popularized the craft with the rotomold process.
Split into simpler sentences: It was invented by Roy Grabenauer in 1968 after years of experimenting with a variety of designs and innovative technologies. Although Tim Niemier is celebrated as having popularized the craft with the rotomold process.