Complex sentence: After 1914, he continued his artistic training at the Stroganov Institute in Moscow, where he created his first abstract drawings, influenced by the Suprematism of Kazimir Malevich, in 1915.
Split into simpler sentences: After 1914, he continued his artistic training at the Stroganov Institute in Moscow. At this early time in his career, he began creating his first abstract drawings, influenced by the Suprematism of Kazimir Malevich, in 1915.