Corrections:
players (subject)
are (present tense verb)
on (preposition)
team (object of preposition)
How (adverb) many (adjective) players (direct object) are (past tense verb) on (proposition) a (definite article) team (subject of proposition)?
Does this seem correct?
players (subject)
are (present tense verb)
on (preposition)
team (object of preposition)
1. "How" - adverb modifying the adjective "many"
2. "many" - adjective modifying the noun "players"
3. "players" - direct object of the verb "are"
4. "are" - linking verb connecting the subject "players" to the adjective phrase "on a team"
5. "on" - preposition indicating the relationship between "players" and "team"
6. "a" - definite article specifying the type of team
7. "team" - subject of the preposition "on"
On a diagram, you could represent it as follows:
(How)
│
(many)
│
(players)
│
┌────────(are)────────┘
│
(on a team)
│ │
(on) │
│ │
(a) (team)
So, the way you have diagrammed the sentence seems correct! Well done!