Complex sentence: The police conducted a thorough search inside the building and found Marinus van der Lubbe, council communist and unemployed bricklayer, who had recently arrived in Germany, ostensibly to carry out political activities.
Split into simpler sentences: The police conducted a thorough search inside the building and found Marinus van der Lubbe. Van der Lubbe, council communist and unemployed bricklayer, who recently arrived in Germany, ostensibly to carry out political activities.