Complex sentence: Richards, 1-3 Oil accumulations, of which there are many in the Ventura province, mainly occur in anticlinal settings modified by faulting; stratigraphy is also influential in creating traps for hydrocarbons.
Split into simpler sentences: Richards, 1-3 Oil accumulations, which are common in the Ventura Basin, mainly occur in anticlinal settings modified by faulting. Stratigraphy is also influential in creating traps for hydrocarbons.