Complex sentences are formed of one independent (main) clause, and one or more dependent (subordinate) clauses. The 'sequence of tenses' rule mean that verbs in the subordinate clause must be 'in agreement' with the verb in the independent clause. http://easyenglishtime.blogspot.com/2014/05/the-sequence-of-tenses.html
..by Milena Ristić
It is indeent of him to take money away from his divorced wife.