Nosotros les damos consejos a todos nuestros clientes.
Explanation:
For this example, the verb "dar" (to give) must be conjugated in first person plural in the simple present tense. The proper form is "damos" then. The indirect object pronoun could replace the indirect object, but in some cases you can use both so there is no need to remove "a todos nuestros clientes". Since the indirect object is a plural noun and it's third person, the proper pronoun is "les".
La primera es usualmente del antuigo testamento La Segunda Lectura es de los salmos y la ultima Lectura es siempre tomada delas cartas del postol San Pablo etc. .