Complex sentence: In 1852, he came to Stockton but by 1853 moved to Oakland, California, where his brother-in-law resided, and became involved in real estate litigation arising from Mexican land grants.
Split into simpler sentences: In 1852, he came to Stockton but by 1853 moved to Oakland, California, where his brother-in-law resided. McKee became involved in real estate litigation arising from Mexican land grants.