Complex sentence: Gortat started his career with ŁKS Łódź, then played three seasons for RheinEnergie Cologne in Germany's Basketball Bundesliga, with whom he won the domestic championship in 2006 and played in the 2006-07 Euroleague season for the first time in the team's history.
Split into simpler sentences: Gortat started his career with ŁKS Łódź, then played three seasons for RheinEnergie Cologne in Germany's Basketball Bundesliga. With them, he won the domestic championship in 2006 and played in the 2006-07 Euroleague season for the first time in the team's history.